This shed is a great quality for the price item! The manual says 3 hours but that is not accurate. Maybe if you've done one before and are then pumping out multiple builds. But I am an owner of a handyman business and it took me, by myself, approx. 6 to 7 hours. But the quality is great and is nice and sturdy. I am a big guy and in order to get the top rood ridge line covers I had to lean on the roof and it supported me with no issues and felt sturdy. I am using this to store rarely used lawn equipment and I went ahead and used Great Stuff Pest Block on all the openings to keep rodents and wasps out. Did add a solar fan to it for some air circulation. Door is a high construction, study product. Unlike other sheds that have flimsy sliding doors these have a nice supportive hinged door.