During the summer, you should only take one or two classes because they’re compressed. Typically, you’ll cover in 6 weeks what you would study over 10 months in HS, so expect 3 hours of hw per day on top of class time for each class you take.
My recommendation would be to twke 1 class, hold on to a part time job, and do something fun&interesting the rest of the time.
During the semester, assume 1 DE class = one intense AP class in terms of hw&time commitment.