That depends on you.
Most men start again within a week.
Others have sex sooner. Some wait longer. But remember, it takes about 15-20 ejaculations to clear sperm out of your system. Use another form of birth control for vaginal intercourse until a semen analysis shows there are no longer sperm in your seminal fluid. You will provide a sample of your semen by masturbating or by using a special condom during sexual intercourse.