To play the other side of this, while I was interning in a big bank my friends in M&A were in work at 6AM and getting in at midnight, every day, even the weeken

To play the other side of this, while I was interning in a big bank my friends in M&A were in work at 6AM and getting in at midnight, every day, even the weekends. They loved it. Bashing on it because it isn't your cup of tea isn't particularly fair. Edit: I'd be interested to hear why I'm being downvoted. Some people I've met love the work and want to put the hours in, this is true across all industries - and especially in start-ups.