This is just an anecdotal generalization, but crazy work hours seem to be correlated with the percentage of H1B employees. Late hours, Saturdays, etc. Have a few colleagues now that left a company like this and tell the stories. The pressure comes from the managers who's entire life is work. My neighbor is a manager at that same company my colleagues left. He is never home, and when I see him outside, he is on a work call, or reviewing work documents.