My boys (10,7 and 5) will spend hours on perfectly beautiful days inside building and rebuilding their lego sets. We have many star wars and chima sets that are all now Frankenstien sets. I really like helping build the sets, but they are never together for more than a day before the star wars space thing gets more guns and the chima house gets a new garage. Here is their hall for this Christmas alone. We have a game room that the mrs and I will not step in for fear of the lacerations to our feet from all the legos in the floor.