For the sake of the riddle one will be called Leo and the other Mini Leo.
Leo's schedule:
1. Peel potatoes (Half an hour)
2. Do the Dishes (Half an hour)
3. Mow the lawn (Half an hour)
Mini Leo's schedule:
1. Mow the lawn (Half an hour)
2. Peel potatoes (Half an hour)
3. Do the dishes (Half an hour)
1 and a half hours of work. :)
But that seems a bit too obvious...