I want to ask from the guys who have experience test  Driven Development in Enterprise web  based application ,

we always have some problem with this method because it's really time consuming especially if you want write test for DAO's

in many cases the time you should spend is not convenient , For instance if you finish a usecase in 5 days how much do you think we should add to its time when we develop it with employing TDD ? if you think it shouldn't extend the time it's really surprising!

I agree with the tips that Mr Iman suggested although I still have some problems with it's time ,and i want to know more about your experience especially in term of time.