Maybe I'm overly skeptical after years of having been lied to by the WT....but from a purely logistical standpoint, the idea that he could cover the amount of territory necessary in the amount of time allotted, just doesn't seem feasible.
Now, granted, there are certain variables in the equation that are highly speculative, such as the speed he would be travelling at. It's quite possible that reindeer travel faster through the air than by land, maybe quite faster. But even if we assume he is travelling the speed of a lear jet, and you factor in all the differen't time zones, I still don't see how he has enough time to complete his task.
Am I missing something, or is the story totally bogus?