Santa has 31 hours of Christmas to work with, thanks to the
different time zones and the rotation of the earth, assuming he
travels east to west (which seems logical). This works out to 822.6
visits per second. This is to say that for each Christian household
with good children, Santa has 1/1000th of a second to park, hop out of
the sleigh, jump down the chimney, fill the stockings, distribute the
remaining presents under the tree, eat whatever snacks have been left,
get back up the chimney, get back into the sleigh and move on to the
next house. Assuming that each of these 91.8 million stops are evenly
distributed around the earth (which, of course, we know to be false
but for the purposes of our calculations we will accept), we are now
talking about .78 miles per household, a total trip of 75-1/2 million
miles, not counting stops to do what most of us must do at least once
every 31 hours, plus feeding, etc.
This means that Santa's sleigh is moving at 650 miles per second,
3,000 times the speed of sound. For purposes of comparison, the
fastest man-made vehicle on earth, the Ulysses space probe, moves at
a poky 27.4 miles per second - a conventional reindeer can run, tops,
15 miles per hour.