Extend Your Session Logout Time in Magento 2

1. Go to Stores → Configuration
2. Navigate to Advanced → Admin → Security
3. Find Admin Session Lifetime (seconds)
4. Enter your preferred duration in seconds
5. Click Save Config
6. Clear cache

How long before admin passwords must be changed:

Location: Stores → Configuration → Advanced → Admin → Security → Password Lifetime (days)

Set to 0 to disable forced password changes.

Lock account after failed login attempts:

Location: Stores → Configuration → Advanced → Admin → Security → Maximum Login Failures to Lockout Account

Default is 6 attempts.

How long account stays locked:

Location: Stores → Configuration → Advanced → Admin → Security → Lockout Time (minutes)

Default is 30 minutes.

If you're still being logged out despite increasing the timeout:

1. Check PHP session settings - session.gc_maxlifetime in php.ini should be >= your Magento setting
2. Check Redis/session storage - If using Redis for sessions, verify TTL settings
3. Check load balancer - Some load balancers have their own timeout settings
4. Browser extensions - Some security extensions clear cookies

If the configuration doesn't save:

bin/magento cache:flush
bin/magento config:show admin/security/session_lifetime

Check if value is locked in app/etc/config.php or env.php.

If sessions work but cookies don't persist:

1. Check cookie domain settings in Stores → Configuration → General → Web → Default Cookie Settings
2. Ensure your domain matches the cookie domain
3. Check for HTTPS/HTTP mismatches