how long can sperm survive out of the body??
that depends on what the conditions are like, if its warm they can survive longer than when its cold. if you freeze it, it can be stored quite a long time.
I would guess that sperm will survive up to a hour in normal room temperature
a sperm survives inside the female body between 3 to 5 days.
if your concern is outside the body as in general, well that depends on the environment, temperature and stuff...
sperm into a jar and leave it for 3 days and you'll have the survival of the fittest only and then take put em into your girl and let them fight and may the best specimen win.
It depends on temperature and moisture...