How Long Is Roomba 690 Cleaning Cycle?

How Long Is Roomba 690 Cleaning Cycle? The patented 3-Stage Cleaning System uses Dual Multi-Surface brushes, a specially designed Edge-Sweeping brush, and vacuum suction to attack everything from small particles to large debris on your carpets and hard floors. Runs for up to 90 minutes* before automatically docking and recharging. How long should the Roomba