Time to go or not?

Yesterday I took my daughter ice skating (her new found favorite activity) and told her we would leave at a certain time only to realize that there was no real reason we needed to be home, so I let her skate till she was done and when I was done , I got a cup of coffee and read a book on my Iphone and learned that sometimes it is better to let a kid decide for themselves when to stop than drag him/her kicking and screaming the hole way home.