I kept mine at my cottage for about 5 years. I had 2 paddocks and garden totalling about an acre and a half, and a tarmac area with two stables. I had 2 ponies and a horse there for most of that time. It's possible, but one has to be very thoughtful about managing the space and the turnout, and if I tried that again, I would manage things a bit differently.
Eventually, I moved them to a small private yard with about 5 acres that I was lucky to nab for a very reasonable cost. The principal reasons for the move were about people: easier access to a support network for land management, forage, riding company, and travel cover. Another reason was that I needed to compartmentalise things in my life, so that the horses were in a space where when I was there, it was "horse time" and not "work time" or "clean the house time". I started riding a lot more again, when they were at a yard. Not having to box to a school helped, as there was a small sand school!
Considerations on a very small acreage:
- Not enough grass, so had to buy in loads of hay. Not necessarily a problem for metabolic horses, though!
- Even with attempting paddock rotation and using the garden as another paddock, not enough space for 24/7 paddock turnout without a tendency to get a sea of mud.
- The largeish hard standing area helped: if I were to try the same again, I would plan from the beginning to limit access to the paddocks to fewer hours, and keep them on the hard standing the rest of the time (with free access wander in and out of the stables). I have several friends who manage on a very small acreage in precisely this way.
- I tried to do things on a budget. It would have been better to invest more from the beginning, to turn part of one of the paddocks into an all-weather turnout area. Or, if the land had been a more suitable shape, I might have tried installing an all-weather track around the outside: that's a very space-saving way of ensuring lots of freedom of movement. But it's not cheap to install, if you want to keep it reasonably mud-free.
I have moved now to a densely-settled area where my only option is a livery yard. I'm on one of the few yards around with no stabled horses, although the stocking rate is very high, with 35 horses on about 10 acres. The manager has thought out an extremely clever system involving large all-weather turnout areas that open onto well-drained track systems all year round, which in turn surround paddocks that are in use only in the grass season. It's a fantastic facility, but must have cost an absolute bomb to set up.