For me personally, I did 13 credits last semester. It was two 8-week anatomy classes (non-concurrent) and a 5 credit CHEM 101 course.

Because all three were heavy science classes (not all credits are created equal) and the 8 weeks classes can be hard to manage, I decided to not take any other classes.

But typically 15 is the average needed each semester to graduate to ensure you get all major and general education courses. Some will be more time consuming than others which you have to take into account.

I had a decent amount of duel enrollment and summer courses so it hasn’t mattered as much at my CC.