It honestly varies depending on what is going on.
If there is a new website/project in the works, I could be working 12-18 hour days until launched. Then it would tapper off from there. In a normal work week, it's anywhere from 2-8 hours (I am talking about actual work, not reading GFY or alike) depending on what requires my attention. I typically will take the weekends off (when possible).
I have hired and outsourced a lot the daily grind work, which has lightened my load. That does not mean it has making my life completely 'stress-free' though. It is a bitter pill you have to learn to swallow when you go this route. Most people's 100% is barely YOUR 25-50% effort by comparison. It is very very frustrating.
That said, no one will have the passion for your business like you do. Even if their pay check it directly tied to it, and their efforts on a daily basis. It is simply something you will struggle to cope with as a business owner if you want some sort of 'enjoyment' out of life via free time.
Making money hand over fist is lovely. I used to work 7 days a week, 18 hour days for YEARS! But you really need to take a step or two back and enjoy that money, and make time for yourself. When I hit my mid 30's I started scaling back, taking vacations, and hiring some people to do the daily grind. I would say the quality of life is better despite the annoyance and frustrations.
