Life is too short to skimp on health and relationships; these things make you happier than money. So set up personal boundaries, and be willing to walk away if they're violated.

Some will tell you otherwise, but my feeling is that 12-hour days can't (and shouldn't) be maintained for more than short bursts. If you're doing 60+ hour weeks every week, you're going to be less efficient...or you're going to burn out. If someone is pushing you to work that much, then you really have to question why you're there. If you're the one doing the pushing, well...stop. Change your priorities. Work will always be there tomorrow, and you can be successful on a normal schedule.

(that said, long hours are somewhat normal at the start of a new job when everyone is bright-eyed and trying to prove themselves. everything in moderation, including moderation.)

(also, yeah, a lot of people here do online dating.)