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It depends a LOT on what kind of smoker you have, what temps you smoke at and what your desired taste is. Best rule of thumb is to go by temp not time.
Basic and very general rule would be
Poultry 180*
Med rare beef 140*ish
pork 170*
these are a little on the high side most will say but it is a start.
Look on the left side of the forum page. There are a variety of how to articles and information such as you are looking for. Also, if you haven't yet, enroll in the 5 day e course. It is a great primer on BBQ in general.