Answer:
Your question is a difficult one to answer because there are many variables that affect how long sperm can live in different situations. What I can say is that sperm do not spontaneously die when the ejaculate contacts air, but they are certainly dead by the time semen has dried. Beyond that, I can only offer that the lifetime of sperm outside the male or female body is about half an hour to a few hours.
yes there could be sperm, dont worry.