community colleges may offer classes other than the traditional 16 week schedule if you're in semesters. at my community college, they have 16 week, 12 week, and two 8 week length courses in a semester. talk to a counselor. you never know until you get the information and then decide without making assumptions.
some colleges you can also withdraw within the first couple days or even week to get most, if not 75 or 50% of the money back. there is a deadline to withdraw, and usually receive a W on your transcript, but it won't affect your GPA. but again, ask a counselor and go over your options. make an appointment first thing Monday morning.