Have you seen the statistics in this thread? It would take him a helluva lot of time to give out all the presents, or he does it

ing fast, lol. Having his reindeer mate then be pregnant and give birth and have them raised would take a lot more time and have to be repeated a lot.
edit:
I thought it would be fun to add this. Let's say Santa eats 3 cookies at every house. So, he eats 275,400,000 cookies each time he goes on his present giving spree. The cookie I just weighed and am now eating

, weighs about an ounce. So, he gains an extra 275400000 ounces every time he does Chrisitmas, I doubt going down chim,neys burns many calories unless he has to really struggle, so I'll disregard that. He now weighs an extra 17,212,500 pounds. OVER 17 MILLION POUNDS!!! (About 1229500 stones if I did the math right....) So, he has his
really fat weight, and the weight of the billions of presents, some that can be huge like TVs and bikes, all in a wooden sleigh pulled by 8 reindeer. Neither would fit in the sliegh, you so you can't expect the huge bag of tpresents and a 17 million pound man to fit in it. Also, I doubt he is able to exercise at that weight, so he'd gain 17 million pounds each year, so he is now 17,281,350,000 17 BILLION POUNDS!!!!. His sleigh would do more than crush a house when it landed, and his weight would make him heavier than a frigging city, he's a giant asteroid, he'd crush everyone. His poor reindeer.
