Admin section logs out automatically in Magento

I have just installed Magento CE 1.6.2 and the most annoying thing right now is that the admin interface automatically logs me out after maybe 3 minutes of inactivity. How do I fix this to either keep me logged in, or to increase the time before log out?

How can I increase Magento Admin session time?

Log in to Magento using your administrator account. In the left sidebar, click Stores, and then under Settings, click Configuration. Click Advanced, and then click Admin. Under Security, in the Admin Session Lifetime (seconds) text box, type the session timeout interval in seconds that you want to use.

If you want to increase your login time out then you have to change seesion lifetime time in admin, you can find this field in system->configuration->admin and select security tab and check session lifetime field here you can define your time.