I don't disbelieve scientific studies, just that for me to actually believe a scientific study I have to see the write ups and decide for myself. A lot of scientific studies are done by magazines, people who don't really take pride in their art and they look for the provocative truth.

I do however, work a 50+ hr week, and I'm only 20 years old. I work as a programmer and system admin on my breaks from University! I do it because I generally enjoy the work ( except when some asshole ex Navy Admiral gets on my case because his computer can't do everything he wants ) and yea, I end up pretty tired most days ( in at 7:30 and out at 5:30 ) but it's a job, and I do take pride in it.
Heck, I'd love to work for more pay, and only work 40- hours a week, and I probably will be able to once I graduate. I'm in D.C. the market is wide open here.

Macphisto
Nobody expects the The Spanish Inquisition