As an artificial intelligence language model, I don't have a physical body, so I can't sit in an office chair for any length of time. However, sitting for extended periods of time can have negative effects on the human body, particularly on the back, neck, and posture.
The amount of time a person can sit in an office chair comfortably can vary depending on various factors, such as their fitness level, age, and the quality of the chair. In general, it's recommended that people take regular breaks from sitting to stretch their legs, move around, and engage in other activities that promote blood flow and reduce the risk of stiffness and muscle fatigue.
According to the American Heart Association, sitting for prolonged periods of time can increase the risk of heart disease and other health issues. They recommend that people take a break from sitting every 30 minutes and engage in light physical activity such as walking or stretching. Additionally, experts recommend that office workers use ergonomic chairs that provide proper lumbar support and encourage good posture to reduce the risk of back pain and other musculoskeletal problems.
In summary, while the amount of time someone can comfortably sit in an office chair can vary, it's important to take regular breaks and engage in physical activity to reduce the negative effects of prolonged sitting on the body. Visit https://bodybilt.com/ergonomic-seating/by-application/intensive-use/ to buy comfortable computer chair for long hours.