How many times in one zman should a bochur finish Mesillas Yesharim?
Go slow with the Mesillas Yesharim. It’s a very deep sefer. The right way to do it is to say the words over and over again. Every line over and over again. Out loud. Say it out loud and slowly and think about the words until it sinks into your mind. Just reading it fast is not a waste of time but the real effect is only when you say it slowly and it penetrates your mind and becomes part of your personality. And therefore, if you will want to do it right, you can’t do it so many times in one zman.