There are different types of testing for Covid-19, meaning that there are going to be different wait times for conclusive results. For some tests, it may take days to get your results, this also includes providers that experience delays because of being overrun with labs. There are also time frames where the test will be most accurate. When a test is taken within five days of onset symptoms, the test is 90% accurate. If the virus has a low amount, the test might not pick up that information.