sperm outside body/mobility

Sperm life and mobility
Hi Could you please help me! Basically the situation, which happen just over a year ago. I masturbated, hence causing an ejaculation. I whipped away sperm that came out, then a couple of minutes later i put my tracksuit bottoms (trousers) back on. My worry is that after you ejaculate there is usally some sperm that comes out usually after the Ejaculation.  My worry is that i could have got small quantity of sperm from my penis onto my inside of my trousers.  1 minute later i had a quick 15 min shower. Then about 40  min later (spent outside)  i had sexual contact with  a lady, hence im worries that from my trousers the small quantity of sperm could have came in contact with hand, then hand to condom ect. I do believe that small quantity of sperm would have been absorbed into the fabric of my trousers.
Q1 Whats the chances of sperm to be live and mobile  1 hour later if you refer to this situation.
Whats the chances of sperm to be live/mobile 3 hours later in such conditions as mensioned.
In such conditions how long for sperm survive do you think?

[Kevin Kennedy, Ph.D.]

Sperm cells that are ejaculated outside the body live for a very short time, ranging from a few minutes or so to at most a few hours. The situation you describe does not really pose a risk re: pregnancy.