Due to the fact that the time spent in each household is so small as to make Santa invisible, perhaps we could also assume that a little cheating is going on?

By employing multiple sleighs & reindeer teams, Santa's workload could be drastically cut by sub-contracting some of the deliveries to his many elves, since no human will be able to tell who actually makes the drop.

Let's not forget that in certain lands Santa's sleigh is supposedly pulled not by flying reindeer but by six white "boomers" (kangaroos). And no, I have no intention of trying to calculate what difference that would make to the timings, speed, and payload figures for the Australian part of the run! [Linked Image]