Is there any study about how much can you study ? Something

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Is there any study about how much can you study ?

Something like whats the most optimal amount of hours/days a week you should put into classes plus studying at home ?

Im trying to decide what Im gonna do this year and I wanted to try and see if I could handle 2 degrees at once.

In my country college has a weird system where you have to approve 6 different courses to enter whatever career you decide and last year I approved 7 different courses so I can take philosophy and communication at the same time

Classes last 2 hours so I could do six hours-four days or maybe two days-six hours and three days-four hours.

I will also try to learn my third language (I want japanese but Im also thinking of german that is easier) and its only 2 hours on Saturdays.

Also if any on you have experience with college and taking a lot of classes and wants to share some tips it would be great.