I *know* the book says that, but I don't think that my kids have ever played that long independently and honestly, it actually wouldn't feel right to me - I actually don't know how long they play on their own, enough for me to do things that I need anyway. I guess I'm always around and about near where they are. If they need me I respond, if they want a play I do, and then they go off and do their thing. I think it's just nice to have kids that *can* play independently for whatever amount of time, but we are social creatures and do crave company and interaction. Even now when Nathan does play on his own (which is the majority of the day) he likes to be in my company. I guess I don't have many days that I'm fully at home with them to know how long they'd play alone, as we're always going on playdates or in the car, down to the mall or park or whatever. I personally wouldn't place too much emphasis on the 40mins (not disagreeing with what Tracy's written), but as long as Abigail can play on her own and 2 x 20mins sounds fine.