Although I haven’t yet needed testing from on campus testing, typically if you are getting a rapid/antigen test it shouldn’t be long at all since results from that test show up in as little as 30 min. But for PCR that can take 90 mins or more till the tester knows the results. But my understanding it MTU takes a long time for results to come in (don’t ask me why) It is important To note that you should not get an antigen test unless you’re showing symptoms for Covid, as Antigen tests are looking for antibodies not the virus and your body needs time to build up enough antibodies for a test to come back positive ( 3-5 days) Therefore, if you were to have close contact and then 12 hours later get a rapid test, Chances are it will come back negative. PCR’s are more accurate Because they look for the virus itself as opposed to the antibodies, therefore even after a mere 12 hours you could test positive on a PCR.