When I first opened my salon I was there at least 50 hours a week, either doing treatments or tidying up, cleaning, doing DIY etc plus doing bookwork a couple of hours at home too.
In the short to medium term whilst the adrenaline is flowing due to the excitement of opening your own business, this is fine, but after the first 2-3 years it dawns on you that you need to pace yourself and that you cannot do EVERYTHING, even if you are a perfectionist you have to let go a bit and trust your staff to take on some jobs to free you up a little bit.
I'm fortunate now ( 14 years later ) to have 3 excellent conscientious therapists working for me who are capable of taking charge and running the salon on their own so I can have time off now and then, in fact I've just had a week off and it's been great.
As someone has said, even when you are not at your salon there are still work-related things which occupy your time, such as promotions, planning new treatments, researching products etc - and as I found this week I have had to go into the salon as the heating and hot water stopped working and I needed to meet a heating engineer there today!
Being a salon owner is definitely NOT mon-fri, nine til five. . . !