While you are operating a Rotor (a large, vertical, rotating cylinder found in amusement parks), you spot a passenger in acute distress and decrease the angular velocity of the cylinder from 3.40rad/s to 2.00rad/s in 20.0rev, at constant acceleration. (The passenger is obviously more of a "translation person" than a "rotation person.")

(a) How much more time would it take until it stops?