[answered] Auto log-out

Just a little problem. When posting responses, I often have to take my time (as I am somewhat long-winded). Unfortunately, while I am typing and mulling over which word to use, the system logs me out of my account. I guess it thinks I'm idle (it wouldn't be alone in this assumption). The problem is that when I get around to actually posting I get taken to the log-in screen. So I log-in again. But instead of posting my response, it deletes it! Arrgh!

I tried to get around this by copying my responses and pasting them. I tried pressing the back button. But every so often I forget to copy and the back button will take me to the original page instead of my carefully thought out response.

Question: Is there anyway to turn off the auto log-out or lengthen my posting time?