Hard! - About 5 hours/1532 attempts, plus practice. ??? Route based off of Zawy's, with a few modifications I found to be more consistent for me. It is definitely worth getting extra time and practicing both horizontal and vertical turnarounds in the mines, the sections of the level with the rocket and gauss, and other technical movement relevant to the level. It is also important to note the places where I waited/stalled in place - these points were to wait for specific cycles. ???