Do it for one commercial for every half an hour or hour that you watch TV. Or do it while your water is boiling, or your toast is toasting, or your microwave is waving. Just standing on one leg without timing it at all, just to see how comfortably you can do it, is beneficial. If you are elderly or for one reason or another your balance is particularly precarious, I recommend doing this in a kitchen with waist high counters very near by, so there's no danger of falling. Also, try different hand and foot positions and see which feel the most comfortable and stable. And be sure to alternate between your left and right legs so both sides of your body get the workout and balance lesson.
If any of you who live in Ashland, Oregon are curious about this exercise and how to do it better, I'd be happy to give you a donation basis, whatever you can afford including nothing, lesson that will steer you in the right direction. Just email me at mail@gene_burnett.com