It took me and another person nearly 5 hours to assemble as the bolts did not align with the fuselage framing as the welded nuts were offset and the thread was not large enough. I had to go to the nearest hardware store to buy a tap and rethread costing $x but took time away from assembling to go to the store. The directions are very confusing as well. The outcome of the teeter totter once completed is good and the kids love playing on it. The quality control out of the China assembly plants is aweful and they should take steps to make sure that they deliver a quality product.