I put the chair together in 25 minutes plus about 5 minutes for unboxing so call it 30 total. Expect 30-45. Some people have had issues with the tension of the seat (not enough). It's good for me @ 170lbs but I don't know if I'd recommend it to people >175 lbs. There is also some concern about the long-term durability of the tension mesh seat we'll see how it lasts. This chair has a TON of adjustability but all of it is just a little. The headrest DOES adjust up or down but only for about a total of 1 inch of travel and it's not easy. It also tilts. If you're 6'+ or have an extra long torso the headrest will likely hit your shoulders and annoy you. The lumber support only adjusts up and down but only about an inch total. An improvement would be more and forward/backward adjustability. The arms CAN be adjusted in and out (toward you or away from you) but it requires loosening the allen bolts and retightening. You only have about 1/2" on either side. Same with the seat and forward/backward adjustability. The seat base literally just sits atop the gas cylinder which just sits atop the base no attachment so there is some concern about becoming disconnected if you try to carry the chair anywhere. Finally even at it's lowest setting the chair sits pretty high. I can't comfortably get my legs under my keyboard tray without resting the tray on my legs. But for the most part it's quite an awesome chair for the price.