I've retired recently, and I have to say that I love it! Although I loved my job, I reached a stage where I had simply had enough. It was my choice to leave when I did, so technically I've retired early at 60.
What I've found is that things expand to fill the day.
Firstly, it's an absolute joy not to have my day dictated by my alarm clock, or my calendar.
Second, it's bliss to be able to sit with a cup of coffee and read the paper, do some of the puzzles in it, at my leisure - especially as the weather is so lovely and I can sit outside.
Third, as we also have friends in a similar position, it's been fantastic to be able to go places/see people and not have to restrict ourselves to the weekend.
When I was working, I worked very, very full-time - long days and often worked in the evenings. Lots of travel too, in the UK and internationally, so I was away from home a lot. I was afraid I'd miss being busy - but I absolutely don't!
It may be early days - I may get bored with it. But it's enabled me to focus more on my own health (as well as going to the gym - not that we can now!) I've started running again, and I'm spending more time learning a language. I've been learning Mandarin for years now, but very slowly - now I have the time to actually focus on it and do my homework!
I'm assuming from your post that you're not contemplating retirement yet, but honestly if you can afford to give up work even for a sabbatical, give it a go! You've obviously been successful with your business, so there's nothing to stop you setting up again - or even doing something else.