Admin Config settings: System => Configuration =>Web => Session Cookie Management => set Cookie Lifetime 259200. And

Go to => System => Configuration => Admin => Security => set Session Lifetime = 259200 (seconds)

Clean the magento cache.

And made changes to php.ini:

session.cookie_lifetime 259200

session.gc_maxlifetime 259200

after all these things admin logged out inactivity of 15 mins.

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