I know, but again, the containter will make a diff. For insance, if you leave it in original container (plastic bottle), it's gonna adjust to your body temp a lot slower than say a condom (material and surface areas are figures you have to consider). I guess I'm trying to say that there's no real way of predicting how long it will take to cool down. Nuking the sample should only be done if it's really cold or something. I think you'd be better off slowly getting it to the right temp and maintaining the right temp.

Try testing some methods out yourself like pocketwarmers vs underside of your nuts. Check the temp with an actual thermometer to be precise as thats' what they're gonna do in the lab.