It depends on how many credit hours the class is. Ussually science classes that reqiure labs are more than three hours and there are some four credit hour classes too, but the majority on my campus are three credit hours
For three credit hour calsses: If you take a class that is twice a week you are there for about 1hr fifteen minutes per day.
If you only go once a week it is three hours
some are three days a week and they are about 55 minutes per day.
It really depends, but look in your schedule of classes and you should see what the hours are for that particular class.
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