How many hours a day to you spend sitting at work? If you work at a desk job, this time sitting probably comes close to your entire workday. According to the New York Times, many Americans spend up to six or seven hours sitting at their desks each day. We are not doing ourselves any favors staying sedentary for long periods of time. In fact, the damage can be so long lasting that even daily trips to the gym will not be able to reverse the harm done. Sitting might as well be the new smoking.