It depends how fast they swim, for Michael Phelps not long.
To come where?
It can take 12 - 72 hours for human sperm to reach the egg.
Ovulation has to happen first before fertilization can take place. Otherwise, the egg would still be in the ovary and the sperm wouldn't be able to reach it.
In the female ovary
To get a female pregnant, your sperm has to reach her eggs. That is the process of pregnancy.
It can take a matter of hours depending on how much sperm there is
How long did it take for robert scott to reach the south pole
How long does it take for a barrel to reach Guyana from New York with laparkan
1 hour
a sec
1.5 weeks.
A day
Actually its takes a matter of seconds to produce a sperm. Millions of sperm are produced in a day.