The sweet spot is 55 to 70 minutes. Some have gone faster, and many go slower. The full range tends to be 45 to 105 minutes. Later laps tend to take most people 10 to 15 minutes longer than earlier laps. If you enjoy Zwift, you can get a sense of the effort required to complete a lap in 45, 60, 75 or 90 minutes with our custom Zwift workouts.