Climbing 110 flights of stairs typically takes about 2 hours if done continuously and with some physical challenge, such as in the 9/11 Memorial Stair Climb events. These events involve climbing the equivalent of 110 stories or 2,200 steps and are physically and emotionally demanding, often taking around 2 hours to complete. This time can vary based on pace, fitness level, and whether the climber is carrying extra weight or gear.
For a typical person climbing at a normal pace without extra gear, it would likely be less than 2 hours but more than a few minutes—usually on the order of 20 to 40 minutes for steady climbing depending on fitness. Thus, the average time to climb 110 flights of stairs is roughly between 20 minutes (fit individuals climbing quickly) and 2 hours (for a strenuous, continuous climb with breaks or added physical load).