How long you can take the pill for the 2nd time should depend on which contraceptive pill is being used. If it is an emergency contraceptive pill, the two doses should be taken 12 hours apart. If it is a short-term contraceptive pill, you should start taking it on the first day of your period and take the second dose every day at a fixed time, i.e. 24 hours apart, for 21 days. If it is a long-acting contraceptive pill, you should start taking it on the 5th day of your period and take another pill at an interval of 20 days. Therefore, when using contraceptive pills, you should decide when to take the second dose according to the pill you are using. Regardless of the type of contraceptive drug, it is a hormonal drug that has more or less adverse effects on the body, so it is best to use it under the guidance of a specialist to minimize the side effects.