I'm not complaining .
Certainly sounds like you are at first since I read the subject as "Coding Rate of Stuff". XD
But it seems that stuff just cools up too fast after impacts. For instance earth can go from a molten world back to a planet with oceans in a year. Huge craters cool in months or something like that. My guess is that it would last quite a bit. I'm no geologist or astrophysician though.
Well, with the atmosphere blown away, I think molten planets could easily give off all their heat via luminal emission, but I don't think the cooldown would be that fast.
This makes me think also, as a suggestion, how about a "nuclear winter" atmosphere after impacts big enough?
Would require atmospheric mechanics, which I heard Dan said wouldn't be looked at for the time being.