A preconception test is a series of tests that are performed before you are ready to get pregnant, usually 3-6 months before you are ready to get pregnant. The time required for preconception tests varies depending on the specific content of the test, and the specific content of preconception tests is not exactly the same from couple to couple. If only routine tests are performed before pregnancy, such as reproductive system tests for both men and women, liver and kidney function tests, and special tests for pathogenic microbial infections, the time required for the tests is usually relatively short, which is about 2h. If special examinations are done, such as full set of teratology examinations and chromosome examinations, the time required is longer. The exact time may vary from hospital to hospital, so you should consult the hospital you are visiting.