Guys. Girls, Do you Do 3 Sets when working out or more or less?

I do 3 sets for now.. i was thinking to start doing 2 or 1 lifting heavy weights, so i can go through a lot of excersises. and i was thinking about doing just a 1 hour exterme workout so that way i can finish early... i work/school and barely can keep up..
Guys. Girls, Do you Do 3 Sets when working out or more or less?
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