Ok assuming that (if there was) Santa has to do all his junk on Christmas eve.
To go around the world, and lets say he only visits children of the Christian faith (i\'m only using christianity as an example)
Santa has something like
1.23 seconds (or less) to get down the chimney, eat his stuff, fill the stockings, say ho ho ho and get his ass back on the sleigh and onto the next house.
He\'s pretty fast for a like a 500 year old overweight man. Hope he doesn\'t drop some lucky saps PS2 in all his hussle and bussle.