I agree with Boatboy24. Lower temperatures will prolong fermentation times. Your hydrometer s.g. readings are a better indicator of when to proceed to the next step. The only caveat to that, in my limited experience, has been in dealing with kits in which there is a sugar addition during fermentation (like WE Chocolate Raspberry Port, for example, that I have made twice). Those should still be perking pretty well when you add the sugar. I let one go just a little longer in primary, and the fermentation stuck when I added he sugar.