My 9-year old had her fill of the club in two short visits. She said that the club was too full of boys who hogged the computers. (She'll be 12 when we return -- perhaps she'll be pleased if all the boys return then). I suspect that if she had really "clicked" with a couple girls in the club, she would have demanded more time there.
My 6-year old, on the other hand, wouldn't get enough of the clubs if we sailed for a month! She's also my more outgoing child, and -- by chance -- she was present for some of the more engaging activities.