diff --git a/extensions/minimax/oauth.test.ts b/extensions/minimax/oauth.test.ts
index 1ad24f37eb4..a4116c4888b 100644
--- a/extensions/minimax/oauth.test.ts
+++ b/extensions/minimax/oauth.test.ts
@@ -1,7 +1,10 @@
+import { MAX_TIMER_TIMEOUT_MS } from "openclaw/plugin-sdk/number-runtime";
 import { afterEach, describe, expect, it, vi } from "vitest";
 import { loginMiniMaxPortalOAuth, normalizeOAuthExpires } from "./oauth.js";
 
 afterEach(() => {
+  vi.useRealTimers();
+  vi.restoreAllMocks();
   vi.unstubAllGlobals();
 });
 
@@ -54,4 +57,152 @@ describe("loginMiniMaxPortalOAuth", () => {
     ).rejects.toThrow("invalid expired_in");
     expect(note).not.toHaveBeenCalled();
   });
+
+  it("caps oversized authorization poll intervals before scheduling", async () => {
+    vi.useFakeTimers();
+    const setTimeoutSpy = vi.spyOn(globalThis, "setTimeout");
+    let callCount = 0;
+    const fetchMock = vi.fn(async (_input: RequestInfo | URL, init?: RequestInit) => {
+      callCount += 1;
+      const body =
+        init?.body instanceof URLSearchParams
+          ? init.body
+          : new URLSearchParams(typeof init?.body === "string" ? init.body : "");
+      if (callCount === 1) {
+        return new Response(
+          JSON.stringify({
+            user_code: "CODE",
+            verification_uri: "https://example.com/device",
+            expired_in: Date.now() + MAX_TIMER_TIMEOUT_MS + 10_000,
+            interval: Number.MAX_SAFE_INTEGER,
+            state: body.get("state"),
+          }),
+          { status: 200, headers: { "Content-Type": "application/json" } },
+        );
+      }
+      return new Response(
+        JSON.stringify(
+          callCount === 2
+            ? { status: "pending" }
+            : {
+                status: "success",
+                access_token: "access",
+                refresh_token: "refresh",
+                expired_in: 3600,
+              },
+        ),
+        { status: 200, headers: { "Content-Type": "application/json" } },
+      );
+    });
+    vi.stubGlobal("fetch", fetchMock);
+
+    const result = loginMiniMaxPortalOAuth({
+      openUrl: vi.fn(async () => undefined),
+      note: vi.fn(async () => undefined),
+      progress: { update: vi.fn(), stop: vi.fn() },
+    });
+
+    await vi.waitFor(() => {
+      expect(setTimeoutSpy).toHaveBeenCalledWith(expect.any(Function), MAX_TIMER_TIMEOUT_MS);
+    });
+
+    await vi.advanceTimersByTimeAsync(MAX_TIMER_TIMEOUT_MS);
+    await expect(result).resolves.toMatchObject({ access: "access", refresh: "refresh" });
+  });
+
+  it("does not sleep past the authorization expiry deadline", async () => {
+    vi.useFakeTimers();
+    const setTimeoutSpy = vi.spyOn(globalThis, "setTimeout");
+    let callCount = 0;
+    const fetchMock = vi.fn(async (_input: RequestInfo | URL, init?: RequestInit) => {
+      callCount += 1;
+      const body =
+        init?.body instanceof URLSearchParams
+          ? init.body
+          : new URLSearchParams(typeof init?.body === "string" ? init.body : "");
+      if (callCount === 1) {
+        return new Response(
+          JSON.stringify({
+            user_code: "CODE",
+            verification_uri: "https://example.com/device",
+            expired_in: Date.now() + 10_000,
+            interval: Number.MAX_SAFE_INTEGER,
+            state: body.get("state"),
+          }),
+          { status: 200, headers: { "Content-Type": "application/json" } },
+        );
+      }
+      return new Response(JSON.stringify({ status: "pending" }), {
+        status: 200,
+        headers: { "Content-Type": "application/json" },
+      });
+    });
+    vi.stubGlobal("fetch", fetchMock);
+
+    const result = loginMiniMaxPortalOAuth({
+      openUrl: vi.fn(async () => undefined),
+      note: vi.fn(async () => undefined),
+      progress: { update: vi.fn(), stop: vi.fn() },
+    });
+
+    await vi.waitFor(() => {
+      expect(setTimeoutSpy).toHaveBeenCalledWith(expect.any(Function), 10_000);
+    });
+
+    const rejection = expect(result).rejects.toThrow("timed out");
+    await vi.advanceTimersByTimeAsync(10_000);
+    await rejection;
+  });
+
+  it("keeps the default poll delay for zero authorization intervals", async () => {
+    vi.useFakeTimers();
+    const setTimeoutSpy = vi.spyOn(globalThis, "setTimeout");
+    let callCount = 0;
+    const fetchMock = vi.fn(async (_input: RequestInfo | URL, init?: RequestInit) => {
+      callCount += 1;
+      const body =
+        init?.body instanceof URLSearchParams
+          ? init.body
+          : new URLSearchParams(typeof init?.body === "string" ? init.body : "");
+      if (callCount === 1) {
+        return new Response(
+          JSON.stringify({
+            user_code: "CODE",
+            verification_uri: "https://example.com/device",
+            expired_in: Date.now() + 10_000,
+            interval: 0,
+            state: body.get("state"),
+          }),
+          { status: 200, headers: { "Content-Type": "application/json" } },
+        );
+      }
+      return new Response(
+        JSON.stringify(
+          callCount === 2
+            ? { status: "pending" }
+            : {
+                status: "success",
+                access_token: "access",
+                refresh_token: "refresh",
+                expired_in: 3600,
+              },
+        ),
+        { status: 200, headers: { "Content-Type": "application/json" } },
+      );
+    });
+    vi.stubGlobal("fetch", fetchMock);
+
+    const result = loginMiniMaxPortalOAuth({
+      openUrl: vi.fn(async () => undefined),
+      note: vi.fn(async () => undefined),
+      progress: { update: vi.fn(), stop: vi.fn() },
+    });
+
+    await vi.waitFor(() => {
+      expect(setTimeoutSpy).toHaveBeenCalledWith(expect.any(Function), 2_000);
+    });
+
+    await vi.advanceTimersByTimeAsync(2_000);
+    await expect(result).resolves.toMatchObject({ access: "access", refresh: "refresh" });
+  });
 });
diff --git a/extensions/minimax/oauth.ts b/extensions/minimax/oauth.ts
index a51fea7d8f1..7870b11bc44 100644
--- a/extensions/minimax/oauth.ts
+++ b/extensions/minimax/oauth.ts
@@ -3,6 +3,7 @@ import {
   MAX_DATE_TIMESTAMP_MS,
   asSafeIntegerInRange,
   resolveExpiresAtMsFromDurationOrEpoch,
+  resolvePositiveTimerTimeoutMs,
 } from "openclaw/plugin-sdk/number-runtime";
 import { generatePkceVerifierChallenge, toFormUrlEncoded } from "openclaw/plugin-sdk/provider-auth";
 import { ensureGlobalUndiciEnvProxyDispatcher } from "openclaw/plugin-sdk/runtime-env";
@@ -259,7 +260,7 @@ export async function loginMiniMaxPortalOAuth(params: {
     // Fall back to manual copy/paste if browser open fails.
   }
 
-  let pollIntervalMs = oauth.interval ? oauth.interval : 2000;
+  let pollIntervalMs = resolvePositiveTimerTimeoutMs(oauth.interval, 2000);
   // The authorization endpoint returns an absolute millisecond deadline.
   const expireTimeMs = oauth.expired_in;
 
@@ -279,7 +280,11 @@ export async function loginMiniMaxPortalOAuth(params: {
       throw new Error(result.message);
     }
 
-    await new Promise((resolve) => setTimeout(resolve, pollIntervalMs));
+    const remainingMs = Math.max(0, expireTimeMs - Date.now());
+    if (remainingMs <= 0) {
+      break;
+    }
+    await new Promise((resolve) => setTimeout(resolve, Math.min(pollIntervalMs, remainingMs)));
     pollIntervalMs = Math.max(pollIntervalMs, 2000);
   }