diff --git a/README.md b/README.md
index 84d11fbd8..3ba720785 100644
--- a/README.md
+++ b/README.md
@@ -294,6 +294,7 @@ These variables configure Hermes Web UI, its local Hermes runtime integration, a
 | `CORS_ORIGINS` | same host only | Comma- or space-separated cross-origin allowlist for HTTP, Socket.IO, and WebSocket requests. Set `*` only when you intentionally need legacy wildcard CORS. |
 | `AUTH_TOKEN` | auto-generated | Explicit bearer token. If unset, Web UI creates one under `HERMES_WEB_UI_HOME`. |
 | `AUTH_JWT_SECRET` | `AUTH_TOKEN` | JWT signing secret override for username/password sessions. |
+| `AUTH_JWT_EXPIRES_SECONDS` | `2592000` | Login JWT lifetime in seconds. Must be a positive integer; invalid values fall back to the 30-day default. |
 | `PROFILE` | `default` | Startup/default Hermes profile. Runtime requests use the profile selected by the frontend and authorized for the current account. |
 | `LOG_LEVEL` | `info` | Server log level. |
 | `BRIDGE_LOG_LEVEL` | `$LOG_LEVEL` or `info` | Bridge log level. |
diff --git a/README_zh.md b/README_zh.md
index a99e0215e..47fbe7b39 100644
--- a/README_zh.md
+++ b/README_zh.md
@@ -299,6 +299,7 @@ Web UI 启动后端聊天能力时，会优先使用包含 `run_agent.py` 的源
 | `CORS_ORIGINS` | 仅同 host | HTTP、Socket.IO、WebSocket 跨源 allowlist，支持逗号或空格分隔。只有明确需要旧版 wildcard CORS 时才设置为 `*`。 |
 | `AUTH_TOKEN` | 自动生成 | 显式指定 bearer token。未设置时，Web UI 会在 `HERMES_WEB_UI_HOME` 下自动生成。 |
 | `AUTH_JWT_SECRET` | `AUTH_TOKEN` | 用户名/密码会话的 JWT 签名密钥覆盖。 |
+| `AUTH_JWT_EXPIRES_SECONDS` | `2592000` | 登录 JWT 有效期，单位为秒。必须是正整数；非法值会回退到默认 30 天。 |
 | `PROFILE` | `default` | 启动/默认 Hermes profile。运行时请求使用前端当前选择且当前账号有权限访问的 Profile。 |
 | `LOG_LEVEL` | `info` | Server 日志级别。 |
 | `BRIDGE_LOG_LEVEL` | `$LOG_LEVEL` 或 `info` | Bridge 日志级别。 |
diff --git a/packages/server/src/middleware/user-auth.ts b/packages/server/src/middleware/user-auth.ts
index c45a093cb..c1958d408 100644
--- a/packages/server/src/middleware/user-auth.ts
+++ b/packages/server/src/middleware/user-auth.ts
@@ -43,6 +43,14 @@ const JWT_AUDIENCE = 'hermes-web-ui'
 const DEFAULT_EXPIRES_SECONDS = 60 * 60 * 24 * 30
 export const MODEL_RUN_EXPIRES_SECONDS = 60 * 60
 
+function userJwtExpiresSeconds(env: NodeJS.ProcessEnv = process.env): number {
+  const rawValue = String(env.AUTH_JWT_EXPIRES_SECONDS || '').trim()
+  if (!/^\d+$/.test(rawValue)) return DEFAULT_EXPIRES_SECONDS
+
+  const configured = Number(rawValue)
+  return Number.isSafeInteger(configured) && configured > 0 ? configured : DEFAULT_EXPIRES_SECONDS
+}
+
 function base64UrlJson(value: unknown): string {
   return Buffer.from(JSON.stringify(value)).toString('base64url')
 }
@@ -151,7 +159,7 @@ export function verifyUserJwt(token: string, secret: string, now = Date.now()):
 
 export async function issueUserJwt(user: Pick<UserRecord, 'id' | 'username' | 'role'>): Promise<string> {
   const secret = await getJwtSecret()
-  return signUserJwt(user, secret)
+  return signUserJwt(user, secret, Date.now(), userJwtExpiresSeconds())
 }
 
 export async function issueModelRunJwt(user: Pick<UserRecord, 'id' | 'username' | 'role'>): Promise<string> {
diff --git a/tests/server/user-auth.test.ts b/tests/server/user-auth.test.ts
index af293541c..d058bd6f6 100644
--- a/tests/server/user-auth.test.ts
+++ b/tests/server/user-auth.test.ts
@@ -266,6 +266,48 @@ describe('user auth tables and middleware', () => {
     expect(userCount.count).toBe(1)
   })
 
+  it('uses AUTH_JWT_EXPIRES_SECONDS for issued login JWTs', async () => {
+    vi.stubEnv('AUTH_JWT_EXPIRES_SECONDS', '7200')
+    const { auth } = await initUsers()
+    const now = 1_000_000
+    const spy = vi.spyOn(Date, 'now').mockReturnValue(now)
+
+    try {
+      const token = await auth.issueUserJwt({ id: 1, username: 'admin', role: 'super_admin' })
+      const payload = auth.verifyUserJwt(token, 'test-secret', now)
+
+      expect(payload).toMatchObject({
+        sub: '1',
+        username: 'admin',
+        role: 'super_admin',
+        iat: 1000,
+        exp: 1000 + 7200,
+      })
+    } finally {
+      spy.mockRestore()
+    }
+  })
+
+  it('falls back to the default login JWT expiry for invalid AUTH_JWT_EXPIRES_SECONDS values', async () => {
+    const { auth } = await initUsers()
+    const now = 1_000_000
+    const spy = vi.spyOn(Date, 'now').mockReturnValue(now)
+    const defaultExpiresSeconds = 60 * 60 * 24 * 30
+
+    try {
+      for (const value of ['7200abc', '30 days', '0', '-1', '1.5', '', String(Number.MAX_SAFE_INTEGER + 1)]) {
+        vi.stubEnv('AUTH_JWT_EXPIRES_SECONDS', value)
+
+        const token = await auth.issueUserJwt({ id: 1, username: 'admin', role: 'super_admin' })
+        const payload = auth.verifyUserJwt(token, 'test-secret', now)
+
+        expect(payload?.exp).toBe(1000 + defaultExpiresSeconds)
+      }
+    } finally {
+      spy.mockRestore()
+    }
+  })
+
   it('signs and verifies user JWTs', async () => {
     const { auth } = await initUsers()
     const token = auth.signUserJwt({ id: 1, username: 'admin', role: 'super_admin' }, 'secret', 1000)