I don't know of any settings that extend the stay, but my system (using FireFox, a wonderful browser) never drops.
A suggestion for long-winded posts or those that take time to compose:
Use a text processor like NotePad to develop and save your post. When you are ready, re-check the thread to see if there has been any activity since you started your post, then create a post, copying your NotePad document.
P.S. Also, I never log out. I just exit when closing down. When I restart, everything is ready to go.
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