When and for how long can I read the result of the self-test?

The test results of the self-tests can be read after different times depending on the manufacturer. Normally, the result can be read after 15 or 20 minutes, depending on the test. After 20 to 30 minutes, depending on the manufacturer, the result may no longer be read off, as it is no longer meaningful. However, the exact times must be taken from the instructions for use of the respective test/manufacturer!