Took just under 2hrs for husband to put up with his tools. I did support some of the side rails to make putting together easier. We both tested the weight and it can positively hold up to 250lbs no problem. But we didn’t try to put both of us on there. It wiggles A LOT with an adult up there. I suggest mounting to the wall for more security (wall mount not included). My very tall 2.5yr old can climb up and down successfully now after a few days of practice, but will not sleep in it yet because he’s afraid of the decent down the ladder at night. Plenty of room underneath to turn into a fort, storage, reading nook, or turn into a dorm style bed with drawers underneath when he’s older. It does not wobble when he climbs the bed, he weighs about 30lbs. Pictured next to the bed is hold old cribtoddler bed for sizing reference. Height of bed comes about halfway up his closet door.