I agree with the others. It depends on how much time, space and money you have! I have 4, and love that number. However, I do feel a little guilty because when Rory was an only bunny, he spent all day, every day out of his cage when I was home (which is most of the time) but now he has to share. When I only had 2 bunnies, I really, really wanted a third. Three is a good number too. We came about having 4 kind of accidentally, but #4 is a wonderful boy. I think my limit, when we have a house with more space, will be 6 or so. 15 years from now I don't see myself having more than 3 or so though because by then I'll hopefully have small children and maybe not as much time to give so many bunnies enough daily attention.