It is possible to set session expire interval for site guest user via profile. I have single page app which is exposed via force.com site. I set session expire interval as 15 mins, and left myself on the middle of the process which I need to complete using my app. After 15 mins I am still able to navigate furhter in my flow. I assume in this case I needs to be redirected to the 1st page in my flow, what I am probably missing here?