science says 24 hours but some guys do two or three times a night
For as long as he's alive.
Yes, as long as the testicle is functioning properly then you can reproduce with one testicle.
NO
Men continue to produce sperm all their lives. there are children are fathered by 90 year old's. the quality and motility of the sperm reduces as a man ages. Between the ages of 30 and 50 there is a 30% drop in the sperm count. and they are 37% slower.
Only one sperm is needed to produce a baby, but when diagnosing male infertility, the rule of thumb is that the man must produce at least 2ml of fluid, with 20 million sperm per ml (so 40 million in a sample), half of which must be motile and correctly formed. If he meets all of this criteria, he is considered fertile. This is tested after 3 days of no sexual activity.
Sperm is produce continuously by the body
It doesn't depend on how much of sperm is produced for a man to be fertile but it depends on the quality of the sperm. Many lifestyle factors affect the quality of sperm, eg. Smoking, excessive alcohol intake , temperature at which the testicles are kept at, etc.
spermatogenesis.
No, the physical equipment is not present.
no
no
no
The overall Count will be a bit lower, but if that testicle is healthy, the man will still be fertile.