I have a 10gal tank in my dorm room also. I wouldnt think you would need 2 air pumps running. I have one small pump to supply Oxygen to my tank. I cant even hear my pump running, and i have the diffuser so it doesnt make large bubbles so there is no bubble noise either.
But as far as your question goes, unless you tank is really over stocked you should be fine just running the pump 12 hr/day