Play dates, only child

[Catsansan]

If your child is an only child and of primary school age, how often do they have playdates each week, and how long do they usually last?

I don't have an only child, but one of my son's best friends is (7 yrs old). He doesn't have many playdates during the school week as he has a lot of energy so his mum directs that into various activities. He has something most days, so finding time where he can come over and play is tricky. But when it is holidays or weekends he often sees friends and that might be for a coupe of hours or an afternoon.