time for sperm to replenish
Answer Wiki. Sperm banks and fertility clinics usually tell sperm donors to go 36 hours without ejaculating before making a donation in order to give their sperm count time to build back up. For most men, it takes between 24 and 36 hours to âreplenishâ all the way after ejaculating and get back to their normal sperm count. However, the testicles are producing new sperm all the time. Even five minutes after a manâs last ejaculation, there are a few sperm ready to go.