Human beings are infatuated with ways to measure their endurance: Usain Bolt’s 100-meter dash, Wilt Chamberlain’s 100-point game, 76 hot dogs in ten minutes, etc.
In ledge skating, this measuring stick is holding a given trick over a long ledge. If it stands to reason that everyone’s first time doing anything on a ledge is a quick grind off the end, then holding it the distance is the true form of mastery.
For this purpose — in New York, at least — The Grate™ is a unit of measure.
Have you been getting really good at backside tailslides? There is no doubt that one of your idiot friends will ask, “D’ya think you could do it over the grate?”