We just added a time control which allows hotspot operators to choose how tickets are processed. This feature is available in your control panel. It is located in the ticket module.

New Time Control.

Tickets can now count down time in two ways,
Continuous or Non-Continuous.

Continuous Time = No Time Saving Feature.
Tickets continuously count down time until the ticket expires.
The user cannot logout to save his unused time.
Even if the user shuts down his computer, his time will continue to
count down on the dhotspot server.

Non-Continuous Time = Time Saving Feature.
This feature allows users to logout and save their unused time.
A user can re-use this ticket unlimited times, untill their time has been exhausted by them.

If turn this control on will make a logout button appear on the landing page (MyWifiTime.com). Turning it off will remove the button and the ability to logout.