Took 4 hours to assemble. However, once you get the hang of it, it is easy. Mirrors are loose and do not fit, you move them too quickly and they will pop out. However, DeckUp offered to get it checked. They offer good customer service. Back boards are too thin. Corners are easy to damage. Edit: After 4 months of use. I packed my shelf with books, causing the bottoms boards to bend under load, making the mirrors come out even with slightest movement. I removed 30% of the books and it is better now.