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.
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it will die in about 45 seconds because sperm is not ment to be exposed to oxygen for long periods of time...sperm has a short life span as it is
The acidity of urine isn't good for sperm and they don't last long in cold water so probably not long. I don't know an exact time though.