The sperm in your semen may still be alive until the semen is fully dried up. This could be several hours, and longer if the semen is contained in a condom.
Too broad a question to answer here. It all depends on the type(s) of evidence being collected and the conditions to which it has been exposed.
immediately
no, sperm cant last long outside the human body and if its dry then there's no way it is alive.
23-48 hours
If a stallion is exposed to an inflamatory process that kills all his sperm it takes about 55-57 days to produce new, viable sperm. A colt generally begins producing sperm at 18 to 24 months.
Yes, sperm can stay alive for about 1-2 days outside of a males body..
science says 24 hours but some guys do two or three times a night
Oxygen doesn't kill sperm; there is plenty of oxygen floating around in your bloodstream. A sperm can live outside of the body for anywhere from a few minutes to a few hours, depending on its health and what the environment is.
Depends entirely on what it is being tested for. -DJ Craig
When the sperm enters the egg it's instantaneous.
It would depend on a few factors including the amount of sperm on the toilet, the ambient temprature and humitidy, but in general if a guy were to ejaculate on a toilet seat, they could only live a few minutes.
Depends on its surroundings. Exposed to air it'll dry out rather quickly, and exposed to environments with a different Ph value is also a rapid killer. But once deposited inside a woman it can linger for days.