Our customers generally need 45 to 70 minutes to assemble the bike. VIPER comes about 95% assembled, there are some final assembly and adjustments needed, like the front wheel, the handlebar, the seat, the pedals, the headlight, the fenders, and the rear rack. For any assembly questions, you can download the instructions on our website https://senadabikes.com/pages/tools, or, contact our support team via contact@senadabikes.com