it happens daily
It can take a matter of hours depending on how much sperm there is
If he stays in long enough and often enough to significantly raise the temperature in his scrotum, then the sperm currently under production will be somewhat degraded. However, sperm is under constant renewal and it doesn't take ling for the sperm quality to bounce back.
1 hour
a sec
A day
1.5 weeks.
Actually its takes a matter of seconds to produce a sperm. Millions of sperm are produced in a day.
It can take 12 - 72 hours for human sperm to reach the egg.
It only takes sperm a few minutes to get inside of an egg.
it dies right when it hits oxegen
18-24 hours
2000 years