A bunch of blahdy blady blah...
You missed the Good Eats Santa Cookie episode. Santa can manipulate time. It makes sense
why would he only travel once a year? Because it takes him a year to visit all the homes. It just
feels like 31 hours to us...
I did miss that episode. So let's see, Santa has 8760 hours to do it instead of 31. Let's even go to 8784, best case scenario is a leap year, right? So he can move 283 (let's round up to 284) times slower. That's still over 8000 mph, more than 10 times the speed of sound. If we simplify the sleigh and reindeer to be a point, which they obviously are not, the lead pair of reindeer still must absorb 1 quadrillion joules of heat per second, each. It might not happen as quickly, but you still end up with reindeer/sleigh/Santa ash.
Manipulating time has it's benefits. You don't burn...