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
seemes 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
and 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 pokey 27.4 miles per
second - a conventional reindeer can run, tops, 15 miles per hour.