One of the great things about being your own boss is you get to mold the work to your preferences. Now you still have to deliver, so unless you are one in a billion or so you likely are going to have to work hard and be smart but you decided exactly how.
Work early, work late, work in your room, work in a co-working space, work on the beach, work with music, work 5 hours 7 days a week, work 12 hours 10 days a month and play the rest... you get to decide.
For your business to work the customers must be happy. So for some businesses, for example, working 10 days a month won't work well but it is all up to you. Which is mainly great, but also can be a bit frustrating.
I find many people end up putting in more hours than they used to complain about their boss making them work. If that is because they love what they do, fine, but often it is just because when many people see how much it costs to take time off they don't want to. I find this funny because they are doing to themselves exactly what they said their former company was doing - prioritizing money over life.
Response to: Not a Morning Person but Need to Run a Business? We Understand
Related: Freelance Lifestyle, Finance and Entreprenuership Blog - Work and Life - Digital nomad and blogging related interviews with John Hunter