Kick passive hanging accounts away

I didn't find where to set up session / login timeout, ie. kick out the user session after 12 hours.

Currently I can have over a week or so session hanging with the onify and it would be better to be able to set cookie sessions to timeout after certain set timelimit. I think this should be adjustable setting somewhere in the onify GUI, but I can manage if it is some setting in other place also.