Usually sellers give guidelines as to tea amount, number of infusions you can get, temperatures to use and brew time of infusions. In the end they are guidelines, and I tend to mess around with it to find the flavor that suits me best.
From personal experience, good quality loose leaf tea almost always lends itself to rebrewing. Once I got some cheap dragonwell green tea from a small Chinese import store, and the second brew had 0 flavor (almost as if I was drinking plain water). Best way to find out is to brew a second/third etc.. time and experiment with different brew times.
Personally I found most green teas last 2-3 brews.
Oolongs usually 5+ (with Taiwanese lightly fermented oolongs being my favorite and most recommended ones for rebrews...it was Alishan or Li Shan oolong that I tried, but don't remember which one exactly)
Puer, well I've only tried 1 decent puer, and it loses most of it's flavor on the third brew, but I've seen some vendors mention Puer having more than 10 rebrews.
Good quality loose leaf is the way to go for rebrews (but good quality does not necessarily mean expensive premium tea)