How much of a difference do you find between the reality of owning your own business and what you imagined it would be like?

For me, I thought I would have all this time to go to the gym and finally get into shape. I find I have less time now than I did when I was doing the 9 to 5 thing. I'm thinking about my business 24-7 and take care of certain things at night when I can't take care of anything else.