The number of hours to first solo and to getting a licence depends on so many factors that I certainly don't think you can blame it on the type of helicopter!
I've never actually heard of anyone taking 65 hours to go solo in the R22. I do find myself wondering if it's the school or the instructor, who knows. From what I've seen, most people solo after 20-30 hours in the R22, and I believe the national average for a PPL(H) is about 60-70 hours, roughly the same as for fixed-wing. But some people do it in minimum hours, and some schools regularly get people through in minimum hours or very little more. I know one of those people; she was a f/w and microlight pilot first, and felt the course was rushed and she'd like to have spent longer over it. And some instructors feel the helicopter PPL should be longer than the f/w one anyway, due to the complexity of helicopters and what they tend to be used for...off airfield landings, flying to hotels, etc etc.
Basically there are a whole lot of issues here, and I doubt that the type of machine is a major factor.