Make sperm last 12 hours?

LeggoMyPreggo

Okay, so I've never thought about this, but how can I make my husband's sperm sample last about 12 hours?

We are working opposite shifts, and don't have time to bd. The way it will need to work, is he leaves the sample in the morning, and it would need to last until I got home at night. I know that preseed will prolong it, but I need to know how to make it last a whole 12 hours outside the body!

PS we have sterile containers and needless syringes, so we are halfway there I feel.

I'm due to ovulate tomorrow or the next day, so I'm in panic mode.