The QuickVue™ At-Home OTC COVID-19 test kit comes with two test strips. This test is designed for one person to test themselves TWICE with these two test strips no less than 24 hours and no more than 36 hours apart. Because COVID-19 takes time to incubate and can take up to 5 days to show up on an antigen test, taking the test twice over time increases the sensitivity of the test dramatically.