If you qualify to work off-campus, you can work up to 20 hours per week:
during regular school sessions, or while you are studying if you are enrolled in an intensive program that doesn’t have scheduled breaks
if you are studying part-time because you are completing the last session of your program
if you are a graduate student who has completed the required courses for your degree
You can work full-time: during scheduled breaks, such as the winter and summer holidays or spring break, and
after you finish your studies if you have applied for any other work permit.
Some school has summer semester and that's NOT A BREAK. If you take the summer semester off, you aren't even eligible to work off-campus 20-hour a week let alone working full time.