realistically, how many hours of studying do you need to guaranteed pass a STEM class

[kathisterima]

For example, you have X h of lectures per week on this class, which sums to Y h of lectures throughout the semester. Do you need to be putting all those hours of studying into that class in order to pass it?

Btw, I know some classes are very demanding and need you to do homework projects alongside the lectures, let's ignore those for the sake of this thread.

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