We have people bumping threads that are YEARS old, there's no real reason to add a poll to a thread indefinitely.
In any case, it's been changed to 5 minutes to match the time you have to change a thread title. If you can't manage to compose a poll in that time, let's face it, you're probably retarded

<3
I want my threads to expire 345432624654625625462435 days after I post it. What's wrong with that gosh.
Maybe 30 years from now Blah changes his mind about how cakes are better than cup cakes... he has a right to multi vote if available.