I didn't think sperm would last that long. It would need 'optimum' conditions.

I know even when my friend had to take her DH's sperm sample for analysis that she put it (in it's jar) down her clevage to keep it at as close to body temperature as possible.

Someone else might know otherwise!
I agree, sperm has to be kept very warm. I drove into the city with dh's sperm the morning I did my IUI and I now have Brooke