Do you have to work crazy hours to run a successful business? No. I don’t think you do. There are plenty of very successful people out there who only work a few hours a day. People who work while the baby is napping, or the kids are at school. People who have a full time job and can only work on their business in evenings or on weekends.
It is possible to be successful without working 16 hour days. This is important, because you have to find the time to look after yourself. You have to eat right and exercise to look after your health, and you have to take some time to relax and to recover so you don’t end up hating what you do.
So, no, I don’t believe you have to work crazy hours in order to succeed, but you do have to work hard when you are working, then plan to rest well when you aren’t.