The bulk of my time was spent reading the same two sentences for hours like a paranoid trying to decipher what the definitions “meant”. Most people would consider that act as being a psycho. However, in math this is considered normal :3. And the best part, your wording of the understanding is almost always similar to the book’s definition as the book’s definition is already simple and elegant enough. Weird… very weird. I’m sure most people would consider this a lunatic behavior.
Anyways, I support Calc 2/3 + Discrete Math.
OR
Analysis 1 + Discrete Math
BUT, I really don’t support Calc 2/3 + Discrete Math + Probability Theory
OR
Analysis + Discrete Math + Probability Theory
Probability theory is one of those things that not everyone gets a “click” early in the semester. And add on with Discrete Math which is also the type of math that some have trouble understanding the first few weeks and… wallah, hectic first exam 
(not saying discrete math is hard. Na, it’s just that it’s a different type of math. It’s a pretty dramatic turn from continuous math like calculus. I personally thought intro discrete math was the easiest math course in college but hey, some people struggled first few weeks due to the dramatic change of view of ‘mathematics’)
That said, from my experience, subjects like math consume time but those times are usually while walking around the campus or eating as you hope for some miraculous inspiration. Subjects like Computer Science requires quite a bit of desk hours due to projects (1 line of code could be like AHHH added on with fact that your partner doesn’t even participate)