diff --git a/docs/product/rooms-access.md b/docs/product/rooms-access.md
index 527c217..1fabe70 100644
--- a/docs/product/rooms-access.md
+++ b/docs/product/rooms-access.md
@@ -27,9 +27,12 @@ the storage decision; implementation detail belongs in code and tests.
 Three independent authorities exist:
 
 1. **Site access.** Production requires an independent
-   `SITE_ACCESS_PASSWORD`. Successful entry creates a 12-hour stateless,
-   HttpOnly, `SameSite=Strict` cookie. It authorizes room creation, Host role,
-   and code-only Viewer attempts; it is not a room credential.
+   `SITE_ACCESS_PASSWORD`. Successful entry creates a stateless, HttpOnly,
+   `SameSite=Strict` cookie with a 24-hour rolling idle lifetime. An already
+   authorized page renews it through the site-access check while it remains
+   active. It authorizes room creation, Host role, and code-only Viewer
+   attempts; it is not a room credential, and Viewer-grant admission cannot
+   create or renew it.
 2. **Host ownership.** The exact Host token authorizes that room's Host and
    access-management operations. It cannot authorize another room.
 3. **Viewer invitation.** Every room creates a 128-bit, 22-character base64url
diff --git a/docs/project-memory.md b/docs/project-memory.md
index 9ebd2e6..f858cac 100644
--- a/docs/project-memory.md
+++ b/docs/project-memory.md
@@ -1,6 +1,6 @@
 # Project Memory
 
-Last updated: 2026-08-27
+Last updated: 2026-08-28
 
 Screener is private, low-latency game screen sharing for one Host and up to 20
 authenticated friends. The current product surface is Web Host, Web Viewer, and
@@ -52,10 +52,11 @@ implementation and routine UI detail.
 
 ## Current Snapshot
 
-Canonical source and production use the strict `screener-v16` Browser/server
-contract with committed media readiness, bounded candidate-relative progress
-and one-shot Host-root convergence. Both retain optional SQLite room authority
-and the H.264/VP8 sender gate. [Status](./status.md) owns exact identity.
+Canonical source uses the strict `screener-v17` Browser/server contract with
+committed media readiness, bounded candidate-relative progress and one-shot
+Host-root convergence. It retains optional SQLite room authority and the
+H.264/VP8 sender gate. [Status](./status.md) owns exact source and production
+identity.
 
 Current work is owned by the [TODO ledger](./todo.md). Open physical evidence is
 owned by [verification status](./verification-status.md). Environment and initial
diff --git a/docs/status.md b/docs/status.md
index 4befbc4..6e5e238 100644
--- a/docs/status.md
+++ b/docs/status.md
@@ -45,7 +45,7 @@ This is the current execution index. Git history owns completed timelines;
 
 ## Current Source
 
-- Canonical source uses the strict `screener-v16` Browser/server contract.
+- Canonical source uses the strict `screener-v17` Browser/server contract.
   Optional SQLite stable authority, non-expiring local preferred code, atomic
   room replacement and the Host codec selector remain implemented; production
   selects stable storage. Graceful restart, crash, timeout and network loss use
@@ -76,6 +76,8 @@ This is the current execution index. Git history owns completed timelines;
 
 ## Source/Production Delta
 
+- Current source uses 24-hour rolling site-access authorization and the v17
+  single wire contract; production remains on the v16 contract until release.
 - Current source replaces aggregate route-fact retries with exact session,
   publication and transition opportunities; advances proved non-improving
   candidates; binds stall and recovery reports to physical media identities;
diff --git a/docs/todo.md b/docs/todo.md
index 4028f82..e8d2189 100644
--- a/docs/todo.md
+++ b/docs/todo.md
@@ -7,9 +7,8 @@ topics are not implementation authority.
 
 ## Now
 
-No implementation task is currently authorized. The audit root-cause
-corrections are integrated and verified in current source but remain undeployed;
-deployment requires explicit authority.
+Release the accepted current source with 24-hour rolling site access and the
+strict v17 Browser/server contract, then record exact production identity.
 
 ## Parked Product Work
 
diff --git a/src/client/App.tsx b/src/client/App.tsx
index 43fd2f5..0a35130 100644
--- a/src/client/App.tsx
+++ b/src/client/App.tsx
@@ -13,16 +13,17 @@ import { ViewerPage } from "./pages/ViewerPage";
 
 const appRoute = parseAppRoute(window.location.pathname);
 const viewerRoute = appRoute.kind === "viewer" ? readViewerRoute() : null;
+const SITE_ACCESS_RENEWAL_INTERVAL_MS = 60 * 60 * 1_000;
 
 type AccessState =
   | { kind: "checking" }
-  | { kind: "ready" }
+  | { kind: "ready"; renewalRequired: boolean }
   | { kind: "required"; error: string | null }
   | { kind: "unavailable"; message: string };
 
 function stateFromStatus(status: SiteAccessStatus): AccessState {
   return !status.required || status.authenticated
-    ? { kind: "ready" }
+    ? { kind: "ready", renewalRequired: status.required }
     : { kind: "required", error: null };
 }
 
@@ -75,6 +76,36 @@ function SiteAccessGate({
     };
   }, []);
 
+  useEffect(() => {
+    if (access.kind !== "ready" || !access.renewalRequired) {
+      return;
+    }
+    let active = true;
+    let checking = false;
+    const timer = window.setInterval(() => {
+      if (checking) {
+        return;
+      }
+      checking = true;
+      void getSiteAccess()
+        .then((status) => {
+          if (active && (!status.required || !status.authenticated)) {
+            setAccess(stateFromStatus(status));
+          }
+        })
+        .catch(() => undefined)
+        .finally(() => {
+          if (active) {
+            checking = false;
+          }
+        });
+    }, SITE_ACCESS_RENEWAL_INTERVAL_MS);
+    return () => {
+      active = false;
+      window.clearInterval(timer);
+    };
+  }, [access]);
+
   async function retry(): Promise<void> {
     setAccess({ kind: "checking" });
     try {
diff --git a/src/server/access-session.ts b/src/server/access-session.ts
index e030de0..a34ab4c 100644
--- a/src/server/access-session.ts
+++ b/src/server/access-session.ts
@@ -1,6 +1,6 @@
 import { createHash, createHmac, timingSafeEqual } from "node:crypto";
 
-const DEFAULT_SESSION_TTL_SECONDS = 12 * 60 * 60;
+const DEFAULT_SESSION_TTL_SECONDS = 24 * 60 * 60;
 const COOKIE_VERSION = "v1";
 
 export interface SiteAccessOptions {
diff --git a/src/server/app.ts b/src/server/app.ts
index 93258a3..40e06ea 100644
--- a/src/server/app.ts
+++ b/src/server/app.ts
@@ -622,7 +622,11 @@ function handleSiteAccessRequest(
   response.setHeader("X-Content-Type-Options", "nosniff");
 
   if (request.method === "GET") {
-    sendJson(response, 200, siteAccessStatus(request, siteAccess));
+    const status = siteAccessStatus(request, siteAccess);
+    if (status.required && status.authenticated) {
+      response.setHeader("Set-Cookie", siteAccess.createCookie()!);
+    }
+    sendJson(response, 200, status);
     return;
   }
 
diff --git a/src/shared/protocol.ts b/src/shared/protocol.ts
index d529671..ea3c513 100644
--- a/src/shared/protocol.ts
+++ b/src/shared/protocol.ts
@@ -6,7 +6,7 @@ import { isCanonicalVideoCodecEvidence } from "./video-codec-evidence.js";
 export const MAX_VIEWERS_PER_ROOM_LIMIT = 20;
 export const MAX_PARTICIPANTS_PER_ROOM_LIMIT = MAX_VIEWERS_PER_ROOM_LIMIT + 1;
 export const MAX_SIGNAL_BYTES = 64 * 1024;
-export const SIGNALING_PROTOCOL = "screener-v16";
+export const SIGNALING_PROTOCOL = "screener-v17";
 export const SIGNAL_CLOSE_CODES = {
   serviceRestart: 1012,
   sessionReplaced: 4001,
diff --git a/tests/protocol.test.ts b/tests/protocol.test.ts
index 08f0e25..e016691 100644
--- a/tests/protocol.test.ts
+++ b/tests/protocol.test.ts
@@ -97,7 +97,7 @@ describe("client signaling protocol", () => {
       "utf8",
     );
 
-    expect(SIGNALING_PROTOCOL).toBe("screener-v16");
+    expect(SIGNALING_PROTOCOL).toBe("screener-v17");
     expect(nativeWire).toMatch(/signalingProtocol\s*=\s*"screener-v6"/);
   });
 
diff --git a/tests/server-http.test.ts b/tests/server-http.test.ts
index 5fc4e17..132d7cc 100644
--- a/tests/server-http.test.ts
+++ b/tests/server-http.test.ts
@@ -167,12 +167,13 @@ async function replaceRoom(
 }
 
 describe("site access", () => {
-  it("reports status and issues a stateless 12-hour cookie", async () => {
+  it("reports status and issues a stateless 24-hour cookie", async () => {
     const baseUrl = await start();
     const initial = await fetch(`${baseUrl}/api/site-access`);
 
     expect(initial.status).toBe(200);
     expect(initial.headers.get("cache-control")).toBe("no-store");
+    expect(initial.headers.get("set-cookie")).toBeNull();
     expect(await initial.json()).toEqual({
       required: true,
       authenticated: false,
@@ -193,21 +194,78 @@ describe("site access", () => {
     expect(authenticated.status).toBe(200);
     expect(setCookie).toContain("screener-site-access=v1.");
     expect(setCookie).toContain("Path=/");
-    expect(setCookie).toContain("Max-Age=43200");
+    expect(setCookie).toContain("Max-Age=86400");
     expect(setCookie).toContain("HttpOnly");
     expect(setCookie).toContain("SameSite=Strict");
     expect(setCookie).not.toContain("Secure");
     expect(setCookie).not.toContain(siteAccessPassword);
 
+    const deniedRenewal = await fetch(`${baseUrl}/api/site-access`, {
+      method: "POST",
+      headers: {
+        Authorization: "Bearer wrong-password",
+        Cookie: cookiePair(authenticated),
+        Origin: allowedOrigin,
+      },
+    });
+    expect(deniedRenewal.status).toBe(401);
+    expect(deniedRenewal.headers.get("set-cookie")).toBeNull();
+
     const status = await fetch(`${baseUrl}/api/site-access`, {
       headers: { Cookie: cookiePair(authenticated) },
     });
+    expect(status.headers.get("set-cookie")).toContain(
+      "screener-site-access=v1.",
+    );
     expect(await status.json()).toEqual({
       required: true,
       authenticated: true,
     });
   });
 
+  it("renews an authenticated cookie across successive idle deadlines", async () => {
+    let now = 1_000;
+    const baseUrl = await start(testConfig(), {
+      now: () => now,
+      siteAccessTtlSeconds: 12,
+    });
+    const authenticated = await login(baseUrl);
+    const originalCookie = cookiePair(authenticated);
+
+    now = 7_000;
+    const firstRenewal = await fetch(`${baseUrl}/api/site-access`, {
+      headers: { Cookie: originalCookie },
+    });
+    const firstRenewedCookie = cookiePair(firstRenewal);
+    expect(firstRenewedCookie).not.toBe(originalCookie);
+
+    now = 13_000;
+    const expiredOriginal = await fetch(`${baseUrl}/api/site-access`, {
+      headers: { Cookie: originalCookie },
+    });
+    expect(expiredOriginal.headers.get("set-cookie")).toBeNull();
+    expect((await expiredOriginal.json()).authenticated).toBe(false);
+
+    const secondRenewal = await fetch(`${baseUrl}/api/site-access`, {
+      headers: { Cookie: firstRenewedCookie },
+    });
+    const secondRenewedCookie = cookiePair(secondRenewal);
+    expect(secondRenewedCookie).not.toBe(firstRenewedCookie);
+
+    now = 20_000;
+    const expiredFirstRenewal = await fetch(`${baseUrl}/api/site-access`, {
+      headers: { Cookie: firstRenewedCookie },
+    });
+    expect(expiredFirstRenewal.headers.get("set-cookie")).toBeNull();
+    expect((await expiredFirstRenewal.json()).authenticated).toBe(false);
+
+    const activeSecondRenewal = await fetch(`${baseUrl}/api/site-access`, {
+      headers: { Cookie: secondRenewedCookie },
+    });
+    expect(activeSecondRenewal.headers.get("set-cookie")).not.toBeNull();
+    expect((await activeSecondRenewal.json()).authenticated).toBe(true);
+  });
+
   it("uses a secure __Host- cookie for production HTTPS", async () => {
     const baseUrl = await start(testConfig({ nodeEnv: "production" }));
     const response = await login(baseUrl);