A half hour to an hour. It is called Duration.
I am going to assume this is adult vs child.
I am going to brainstorm about things that children don't usually do to arrive at some suggestions...
driving a car safely, running a business, preparing a large meal
Some difficult things for adults...
crawling long under things, sitting on the floor for long periods of time, eating babyfood daily
I had fun exploring this. Make up your own examples!
