diff --git a/src/infra/provider-usage.fetch.shared.test.ts b/src/infra/provider-usage.fetch.shared.test.ts
index 72195d9f01f..0fea8ee4b11 100644
--- a/src/infra/provider-usage.fetch.shared.test.ts
+++ b/src/infra/provider-usage.fetch.shared.test.ts
@@ -7,6 +7,8 @@ import {
   parseFiniteNumber,
 } from "./provider-usage.fetch.shared.js";
 
+const MAX_TIMER_TIMEOUT_MS = 2_147_000_000;
+
 function requireFetchCall(
   mock: ReturnType<typeof vi.fn>,
 ): [URL | RequestInfo, RequestInit | undefined] {
@@ -92,6 +94,19 @@ describe("provider usage fetch shared helpers", () => {
     }
   });
 
+  it("caps oversized request timeouts before scheduling", async () => {
+    const timeoutSpy = vi
+      .spyOn(globalThis, "setTimeout")
+      .mockReturnValue(1 as unknown as ReturnType<typeof setTimeout>);
+    vi.spyOn(globalThis, "clearTimeout").mockImplementation(() => undefined);
+    const fetchFnMock = vi.fn(async () => new Response("{}", { status: 200 }));
+    const fetchFn = withFetchPreconnect(fetchFnMock);
+
+    await fetchJson("https://example.com/usage", {}, MAX_TIMER_TIMEOUT_MS + 1_000_000, fetchFn);
+
+    expect(timeoutSpy).toHaveBeenCalledWith(expect.any(Function), MAX_TIMER_TIMEOUT_MS);
+  });
+
   it("maps configured status codes to token expired", () => {
     const snapshot = buildUsageHttpErrorSnapshot({
       provider: "openai-codex",
diff --git a/src/infra/provider-usage.fetch.shared.ts b/src/infra/provider-usage.fetch.shared.ts
index 2fc7826d8c1..84e1d877e01 100644
--- a/src/infra/provider-usage.fetch.shared.ts
+++ b/src/infra/provider-usage.fetch.shared.ts
@@ -1,3 +1,4 @@
+import { resolveTimerTimeoutMs } from "../shared/number-coercion.js";
 import { parseFiniteNumber as parseFiniteNumberish } from "./parse-finite-number.js";
 import { PROVIDER_LABELS } from "./provider-usage.shared.js";
 import type { ProviderUsageSnapshot, UsageProviderId } from "./provider-usage.types.js";
@@ -8,8 +9,9 @@ export async function fetchJson(
   timeoutMs: number,
   fetchFn: typeof fetch,
 ): Promise<Response> {
+  const safeTimeoutMs = resolveTimerTimeoutMs(timeoutMs, 1);
   const controller = new AbortController();
-  const timer = setTimeout(controller.abort.bind(controller), timeoutMs);
+  const timer = setTimeout(controller.abort.bind(controller), safeTimeoutMs);
   try {
     return await fetchFn(url, { ...init, signal: controller.signal });
   } finally {