Train by completing as many reps and exercises as possible during each session. You want to complete tasks like fifteen lifts and take a minute or less break in between. Doing so is important in stimulating muscle growth because of the lactic acid. Repeating this many times in each session will maximize muscle-building.
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Don't bother lifting for more than an hour at a time. Once a workout goes beyond the hour mark, the body will produce excess cortisol, which is the human stress hormone. The cortisol can block testosterone and waste the efforts you are putting toward your muscle building. Making sure that workouts are less than an hour helps you to get the best results.

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