Deciding on a domain name

[Shortie861]

When it comes to deciding on a domain name it can be hard to find one that works for your site and that isn't already taken by someone else. How long do you find it takes to think of a domain that works and is not taken? 

I remember with the domain I have now it took me a good few hours to think of something that worked and wasn't taken. For as simple as the domain name is you wouldn't think it took me as long.