Overload semesters are very rough, but they are not impossible!
For some context, I'm a freshman who is double majoring (hence the overload), and I require these general education courses for the degrees I am seeking at the university I'm transferring to this fall. This semester I barely worked (although I am employed at a restaurant); I spent about 16 hours a week in class (I took PHYS 212 and ENGL 202C at WC/online) and roughly 6-12 hours a day every day (Monday through Sunday) working on assignments, labs, reading, and studying outside of class. On average, I would say I spent 80-90 hours a week—each week—on all school-related work.
It was an absolutely brutal semester, although I had slightly more time in any given week after spring break because PHYS 213 is only a half-semester course. I don't know how I managed the marks that I did, but going into this semester, I had zero confidence that taking 23 credits was possible. I figured that I would maybe end with some mid-to-high Bs or possibly some A minuses. For anyone who is intimidated by an overload semester—it is by no means an easy 16 weeks—it is certainly possible if you are not working on the side (or are taking less-demanding courses) and have no major life obligations. Make sure to take at least an hour or two out of your day to do something that you enjoy; your mental health will go to shit otherwise.
I'm taking MATH 230, MATH 250, CAS 100A, and SPAN 003 this summer semester, so I am in for another couple of terrible weeks. I wish you all the best if you have to or plan on taking an overload semester <3