The volume of your training must fit with your lifestyle & your genetics.....Point 1 is up to you....Point 2 you have to deal with......
the more you train the more you need "food" and sleep, and more water intake.....there´s also a difference if you use hormones or anabolics, or you train strictly natural.
Also an option is to work out some weeks with a high volume, and than cut down to a medium or low volume for some time. You must take care of the Bodys signals and if your training is going well or if you reach a plateau.