Follow Santa....NORAD Santa Tracker
For those gifts he delivers on Christmas Eve, some folks estimate that he has between 36-45 hours, considering time zones and International date lines sort of stuff. We know that he actually has Jean-Luc Picard's Maximum Warp engines on his sleigh and he can use if needed, a Time-turner (which he created) similar to the one Hermione Granger uses.
Also, Some places don't receive his gifts until January 6th, so he has time to get home, grab a glass of alka-seltzer, and pack a few extra carrots for the reindeer before heading off again.
MERRY CHRISTMAS TO ALL!