"I received the LEGO Rough Terrain Crane as a combined birthday/Christmas gift from my wife. On Boxing Day I started with book 1 and finished a week later - 2.3 hrs a day = 16 hrs total time. Absolutely enjoyed every moment of it even at my age. Very professional toy - well designed, easy to follow instructions for such a complex piece of engineering genius. The perfection of the LEGO mould fits together beautifully."