asp.net 2010 web page staying active

Question

I am working on a C# 2010 web form application that I will deploy within the next day or two. I am assuming there is probably some kind of a time limit that the web form pages will stay active?

If so, can you tell me where i can find how long a web form will stay active in case I need to increase or decrease the timeout limit?

If not, is there no time limit?

Can I overrride a timetime limit if I want to?