Can you make it so that users aren't automatically logged out?
 

I used to be on SMF and users had the option of choosing to stay logged in "forever" or "1 hour" "1 week" or "1 month." Is there anything like that on vBulletin?

Yeah, its already there, what you do is put your info in on the login menu, then tick the box that says "remember me" click that and it should work, every time you visit that site, it will remember you and automatically log you in. Another issue if that doesnt work is your browser doesnt save that stuff.

Thank you!

Following from Ronald0

Ticking the "Remember me" box will set your browser to remember you untill you clear your internet cookies.
FireFox and Safari are best for this "Remember me" feature, IE may reject your quest as the coding is alot different.