This issue also seems to vary, depending on which browser you use. I had a client having the same problem with a forum they were running - some people were taking too long to type in their posts, and were getting automatically 'logged out', and losing their writing. What we found was, that in some browsers (like Apple's Safari), you just need to 'go back'/'return', and the browser will remember the full contents of what you were typing.
Some browsers, however (like FireFox) DO forget what you had entered.
Although icouto is correct in saying some browsers (such as Safari) remember the contents of your posted form when you use back/forward, I don't think session lifetime will vary.
This option can be set in the PHP.ini file, a we should hopefully be able to use ini_set or similar to make it configurable from WB. Please support as a ticket

Also, next time, please try to use a more pleasant title (although I do understand how this problem can be annoying

).
Ryan
