These heavy duty office chairs were designed to with stand 24 hour a day 7 day a week intensive use. Stop replacing chairs because you exceed their designed work load. All of our chairs shown within the 24 hour call center chair category have manufacturer backed warranties that cover each chair for round the clock usage. With heavy duty bases, gas cylinders, frames and seat pans these chairs are able to withstand any intensive use application. Multiple shift office chairs that include specific adjustments such as height adjustment and adjustable armrests will allow each chair to adapt to wide range of users.