''Flight Simulator'' Workout

''Flight Simulator''
Complete the following pyramid of Single-unders for time against a 12:00 Running Clock:
20-40-60-80-100-120-140-160-180-200

Notes: Complete each rung on the ladder unbroken before moving on.
All the way up and down is a complete evolution.

Achieved 20 in the first 2 min, spent the remaining 10 minute failing to reach 40 unbroken, but kept attempting for the duration of the WOD.