We take ours for long walks a few times a week. We have a fenced-in backyard, so they play alot and wear themselves out right at home. Pup often doesn't get to go on walks though, because, with her hip dyplasia, she would be sore for days afterward.
We often walk two or three of the greyhounds together, and they are easy to manage. Some people we know who have 16 greyhounds will often walk 6 a piece.