So, can you push and pull?

How can you bring the temperature up by putting it in your coat when it's still cold from the outside environment?

I've done this in extreme cold situations. It still didn't warm up enough to develop in 5 minutes.

How does the color shift with color if you go over or under?

Seems there is just as much confusion out there too.

What if I am under 50F (~10C) and the time would have to go even longer than 4 1/2 minutes. Is the damn thing just not going to develop?