With the exception of the ridiculous 2 hours of sleep on Monday, he actually gets more sleep than I do. But then he has only 3 hours of free time. Sounds like a wonderful life of joy and happiness.
To be honest though: If you manage to have a successful comic in Shounen Jump, you are one of the most successful comic creators out there. The story you write and draw is around often for 10+ years, usually gets animated, maybe even turned into movies. If you do it right and are able to keep most of the rights to your comic (I don't know how Shounen Jump or similar publishers work), you might not have to work much after you completed your series.
If someone would come to me tomorrow and would tell me I would have publish my comic and work like crazy for the next couple years, but then I will have enough money to enjoy life comfortably afterwards - sign me up for it.