It's just like studying at any other college you can work 20 hours per week .
It depends on your course and the job you work at, you must balance the school and work hours so that if you have a lot of homework and projects then work can get in the way.
Dont get a hard a job(that will exhaust your mind) if you have a lot of course work rather get an easier one that doesnt require much thinking such as dish washer you can do this as a zombie.