When to give up?
 

When it comes to blogs, TGPs or free sites in general, how much time do you usually give a niche before you call it quits?

Im not looking for a definate timeline, just what other webmasters think. If you put a lot of effort into a site you just start, how much time would you give it before you cut your losses if it doesnt sell well?

I treat everything online with standard business goals.

Two years to profit or can it.