Smoke+Fire freezes after 250 frames

Hey!

In my animation the effect just freezes after 250 frames. Can i somehow increase how long it´s animating the Smoke+Fire.
I have read about smoke bake etc. but if i go under Properties->Smoke->Domain everything under Properties->Smoke->Flow resets and the flow type is Smoke again. I would settle for a normal smoke effect too but if i stay at “Domain” no effect is appearing at all.

Would appreciate your help. (Sry for the bad english^^)

Edit: Realized that the Domain is the Area where the effect takes place. Problem Solved.