Going to keep this short, one of my mates for close to two decades of gaming (EvE, SC) is damn lucky to be alive. 70-80 hour weeks holding his company up because they won't hire people to take the load off. He went in for chest pains and had a widowmaker heart attack in the waiting room. He's damn lucky to be alive, would not be if he wasn't already in the waiting room.
Do not let them work you to death. They don't give a fuck beyond you won't show up to keep doing the work. I'm pissed enough to get the pitchforks and torches.