Straighterline Math courses - what are they like?

[Ideas]

I took Calculus II.  That class was both extremely difficult and somewhat doable at the same time.  Everything except the final is open book.  So, the ability to search was very helpful.  The final is not open book, but one page of notes is allowed.  I recommend spending a lot of time on developing a final exam note strategy.

Could you say roughly how long you spent on this course? I'm trying to figure out when I can fit in into my schedule, but I'd rather not pay for the course in advance. So I don't have a lot to go on in terms of estimating hours it will take for the entire thing. Thanks!

Before you did this course, you were decent at Calc I? I believe I would find Calc I somewhat challenging right now.