If I am a college student and work for Federal Work-Study during the class terms and work a part-time job during winter and summer break, would I need to put 2 jobs or 1?

I live with parents but work with my community college with federal work-study January through April and work a part-time job during christmas and summer break, and was wondering if I would fill on my W-4 that I work 2 jobs or 1 if they do not overlap.