If Santa had to deliver all gifts within just one hour (say, midnight to 1 a.m.), in each of 24 time zones, then he could spend an average of one hour in each time zone and finish in 24 hours. However, assuming he gets an early start at 7 p.m. in the first time zone and ends at 7 a.m. in the last time zone, that would only give him 12 extra hours, for a maximum of 36 hours across 24 time zones, so he would spend an average of 90 minutes in each time zone. (Time zones in the middle of the ocean or other regions with no Christian children present would go significantly faster).

But even starting at 7 p.m. at the Date Line, and ending at 7 a.m. around the other side of the Date Line, that's still no more than 36 total hours from any time zone's point of view. In 49 hours, the sun would have risen and set twice in EVERY time zone on Earth (and Mars, for that matter), so there's no way that Christmas Eve could last 49 hours, no matter where you are on Earth.