Roll again and watch the clock. You again have one minute.
This is how you will stroke from now on until I tell you otherwise: I want your thumb and pointer finger to be down at the base of your cock. You may have to turn your hand around. Your pinky finger should be at the top, and you should be able to look down and see the back of your hand. Your thumb should be curled around the underside at the base, near your balls. Your fingers should be curled downwards, not upwards. Get a good grip on your cock this way. Understand?
Stroke with your hand like this until you are told otherwise. If this is not the way you usually do it, it may take some getting use to. I think you'll find it more pleasurable in the long run.