diff --git a/auto-analyst-frontend/docs/system/authentication.md b/auto-analyst-frontend/docs/system/authentication.md
index 86b12e1c..482d7c95 100644
--- a/auto-analyst-frontend/docs/system/authentication.md
+++ b/auto-analyst-frontend/docs/system/authentication.md
@@ -1,248 +1,62 @@
-# Authentication System Documentation
-
-Auto-Analyst uses NextAuth.js for comprehensive authentication management.
-
-## Authentication Overview
-
-### Supported Providers
-- **Google OAuth** - Primary authentication method
-- **Credentials** - Admin temporary login
-- **Guest Mode** - Limited trial access
-
-### NextAuth Configuration
-```typescript
-// app/api/auth/[...nextauth]/route.ts
-const handler = NextAuth({
-  providers: [
-    GoogleProvider({
-      clientId: process.env.GOOGLE_CLIENT_ID,
-      clientSecret: process.env.GOOGLE_CLIENT_SECRET,
-    }),
-    CredentialsProvider({
-      name: "Temporary Login",
-      credentials: {
-        password: { label: "Temporary Code", type: "password" },
-      },
-      async authorize(credentials) {
-        if (credentials?.password === process.env.NEXT_PUBLIC_ANALYTICS_ADMIN_PASSWORD) {
-          return {
-            id: "admin",
-            name: "Administrator",
-            email: "admin@example.com",
-          }
-        }
-        return null
-      }
-    })
-  ],
-  callbacks: {
-    async signIn({ user }) {
-      // Save user profile to Redis on first login
-      await profileUtils.saveUserProfile(user.id, {
-        email: user.email,
-        name: user.name,
-        image: user.image,
-        joinedDate: new Date().toISOString(),
-        role: 'Free'
-      })
-      return true
-    }
-  }
-})
-```
+# Google OAuth Setup Guide
 
-## Session Management
+This project uses Google OAuth 2.0 for authentication. Follow these steps to set it up on your own Google Cloud account.
 
-### Client-Side Sessions
-```typescript
-// Using useSession hook
-const { data: session, status } = useSession()
+---
 
-if (status === "loading") return <Loading />
-if (status === "unauthenticated") return <LoginPrompt />
+## Prerequisites
 
-// Authenticated user
-return <Dashboard user={session.user} />
-```
+- A Google Account
+- Access to [Google Cloud Console](https://console.cloud.google.com/)
+- Local environment or deployed domain (e.g., `localhost:3000`, `yourdomain.com`)
 
-### Server-Side Sessions
-```typescript
-// API routes authentication
-export async function GET(request: NextRequest) {
-  const token = await getToken({ req: request })
-  
-  if (!token?.sub) {
-    return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
-  }
-  
-  // Proceed with authenticated request
-}
-```
+---
 
-## User Profile Management
-
-### Profile Storage (Redis)
-```typescript
-// lib/redis.ts
-export const profileUtils = {
-  async saveUserProfile(userId: string, profile: UserProfile) {
-    await redis.hset(KEYS.USER_PROFILE(userId), {
-      email: profile.email,
-      name: profile.name || '',
-      image: profile.image || '',
-      joinedDate: profile.joinedDate || new Date().toISOString(),
-      role: profile.role || 'Free'
-    })
-  },
-  
-  async getUserProfile(userId: string) {
-    return await redis.hgetall(KEYS.USER_PROFILE(userId))
-  }
-}
-```
+## Setup Instructions
 
-### Profile Context
-```typescript
-// lib/contexts/user-context.tsx
-const UserProvider = ({ children }) => {
-  const { data: session } = useSession()
-  const [userProfile, setUserProfile] = useState(null)
-  
-  useEffect(() => {
-    if (session?.user) {
-      fetchUserProfile(session.user.id)
-    }
-  }, [session])
-  
-  return (
-    <UserContext.Provider value={{ userProfile, updateProfile }}>
-      {children}
-    </UserContext.Provider>
-  )
-}
-```
+### 1. Create a Google Cloud Project
 
-## Authentication Flow
+- Visit [Google Cloud Console](https://console.cloud.google.com/)
+- Click "Select a project" → "New Project"
+- Name your project and click **Create**
 
-### 1. Login Process
-```
-User clicks "Sign in with Google"
-  ↓
-Google OAuth consent
-  ↓
-NextAuth callback processing
-  ↓
-Profile saved to Redis
-  ↓
-Session created
-  ↓
-User redirected to dashboard
-```
+---
 
-### 2. Logout Process
-```typescript
-const handleLogout = async () => {
-  // Clear local state
-  clearMessages()
-  clearCredits()
-  
-  // Sign out from NextAuth
-  await signOut({ callbackUrl: '/' })
-}
-```
+### 2. Configure OAuth Consent Screen
 
-## Protected Routes
-
-### Page Protection
-```typescript
-// app/admin/page.tsx
-export default function AdminPage() {
-  const { data: session, status } = useSession()
-  
-  if (status === "loading") return <Loading />
-  
-  if (!session?.user?.isAdmin) {
-    redirect('/login')
-  }
-  
-  return <AdminDashboard />
-}
-```
+- Go to `APIs & Services → OAuth consent screen`
+- Choose **"External"** → Continue
+- Fill in app details (name, email, etc.)
+- Add test users for development use
 
-### API Protection
-```typescript
-// Middleware for protected API routes
-export async function authMiddleware(request: NextRequest) {
-  const token = await getToken({ req: request })
-  
-  if (!token) {
-    return new Response('Unauthorized', { status: 401 })
-  }
-  
-  // Add user info to request
-  request.userId = token.sub
-}
-```
+---
+
+### 3. Create OAuth Credentials
+
+- Go to `APIs & Services → Credentials`
+- Click `+ CREATE CREDENTIALS → OAuth client ID`
+- Select:
+  - **Application type**: `Web Application`
+- Add **authorized redirect URIs**, e.g.:
 
-## Security Features
-
-### CSRF Protection
-- Built-in NextAuth CSRF protection
-- Secure cookie configuration
-- SameSite cookie policies
-
-### Session Security
-```typescript
-// nextauth configuration
-export default NextAuth({
-  session: {
-    strategy: "jwt",
-    maxAge: 30 * 24 * 60 * 60, // 30 days
-  },
-  jwt: {
-    secret: process.env.NEXTAUTH_SECRET,
-  },
-  cookies: {
-    sessionToken: {
-      name: "next-auth.session-token",
-      options: {
-        httpOnly: true,
-        sameSite: "lax",
-        path: "/",
-        secure: process.env.NODE_ENV === "production",
-      },
-    },
-  },
-})
+```bash
+http://localhost:3000/api/auth/callback/google
+http://localhost:3000/auth/signin
 ```
 
-## Guest User Support
-
-### Anonymous Access
-```typescript
-// lib/store/freeTrialStore.ts
-const useFreeTrialStore = create(
-  persist(
-    (set, get) => ({
-      queriesUsed: 0,
-      maxQueries: 5,
-      
-      hasFreeTrial: () => get().queriesUsed < get().maxQueries,
-    }),
-    { name: 'free-trial-storage' }
-  )
-)
+```bash
+https://yourdomain.com/api/auth/callback/google
+https://yourdomain.com/auth/signin
 ```
+- Click **Create**
+
+---
+
+### 4. Set Environment Variables
+
+Create a `.env.local` file in your project root and add:
 
-### Guest Session Handling
-```typescript
-// Guest users get temporary session IDs
-const getGuestId = () => {
-  let guestId = localStorage.getItem('guestUserId')
-  if (!guestId) {
-    guestId = `guest-${Date.now()}`
-    localStorage.setItem('guestUserId', guestId)
-  }
-  return guestId
-}
-``` 
\ No newline at end of file
+```env
+GOOGLE_CLIENT_ID=your-client-id-here
+GOOGLE_CLIENT_SECRET=your-client-secret-here
+```
\ No newline at end of file
diff --git a/auto-analyst-frontend/lib/credits-config.ts b/auto-analyst-frontend/lib/credits-config.ts
index 719659d0..1be559bc 100644
--- a/auto-analyst-frontend/lib/credits-config.ts
+++ b/auto-analyst-frontend/lib/credits-config.ts
@@ -49,9 +49,9 @@ export interface TrialConfig {
  * Trial period configuration - Change here to update across the entire app
  */
 export const TRIAL_CONFIG: TrialConfig = {
-  duration: 15,
-  unit: 'minutes',
-  displayText: '15-Minute Free Trial',
+  duration: 2,
+  unit: 'days',
+  displayText: '2-Day Free Trial',
   credits: 500
 }