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 stocking, 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 75.5 million miles, not counting stops to do what most of us do at
least once every 31 hours, plus feeding, etc.
This means that Santa's sleigh is moving at 650 miles per second, about
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.