Free testing will last from Dec. 16 to Jan. 15, 2021. Tests can be taken every five days and sampling centers should be open on Dec. 24 for four hours, as well as on Dec. 26. Centers will close Dec. 25 and on Jan. 1, 2021. It's important to check the individual opening hours of a collection point as it has been reported that they can vary widely. You can get multiple tests. However, you need to wait five days between tests.