set a max time for the session?

[appjitsu]

I want to set the max time per session to be 30 minutes. How would I do that?

[paschaldev]

I need this too +1

[Taymindis]

It's already have, just check the document closely.

[lid3rs]

It's already have, just check the document closely.

Could you please show where? I am not able to find it neither.