Some (small) percentage of people would actually prefer to work 14 hours starting at 11 AM than 8 hours starting at 7:30 AM. But...

I learned something at my first few startups... if you are working 14 hours consistently:

1. You will get burnt out quickly

2. Probably only 6 of those hours are productive.

If you tell employees to work 14 hours they will record 14 hours in their time sheet but they are probably not actually "working" effectively.

Now as the CTO of a startup I consider it my personal mission to grow and improve the product by making sure the team workers more efficient not longer hours. I get the same 6 productive hours out of the team and much happier employees. In fact, it could be a coincidence, but this go around we ship features faster and have less bugs then when I was at a company that demanded 12+ hours.

With that said, I also grew a lot as a person and manager during that time. And learned what is effective and what is ineffective uses of time. If you aren't able to answer the question of what will have the largest impact and what is the best use of time than it is easy to end up with people working 80 hour weeks.