See how many minutes you can get to. First minute 3 Burpees, 2nd minute 6 Burpees, 3rd minute 9 Burpees, 4th minute 12 Burpees, 5th Minute 15 Burpees........etc, etc.....
Efforts should be "bump and go", no rests or dropping between lifts. Perfect form to be maintained throughout. Letting go of the bar or dropping would be considered a fail.