When you are taking a pregnancy test, how long you have to wait to see results depends on the test. It could be less than a minute, five minutes, or as long as 10. With manual tests, try not to lose your patience and decide that the test must be done before the time it says on the package. Likewise, you can’t necessarily trust the results if you pull a test you took out of the trash hours later: Some manual tests will have a line appear after a while that does not reflect a positive result. This is a so-called “evaporation line,” which is just a mark made when your urine evaporates from the test and can be mistaken for a positive result.