always time out in 15 minutes

working on trying to create some galleries on my WP site. My site would always log me out in 15 minutes. If I’d go to get a cup of coffee or something I’d come back to find that I’m logged out.

So I downloaded & activated this plugin. Have regular timeout for 1 day & preferred user timeout in 2 weeks. Still I get logged out every 15″.

https://www.ads-software.com/plugins/configure-login-timeout/