They're also not symmetrically distributed because delays are much larger than surprise wins. A win of 50% and a delay of 50% is already non-symmetrical, because the delay will be quite a bit larger, and the real numbers are even worse. A 5x delay on a particular element would be unsurprising, but to estimate something and then have it surprisingly cut to 1/5th the time is something I've only seen a handful of times in my career. "Oh! There's a library in the code that already does exactly this!"

The distribution of delays is pathological, too. It's not normal or poisson or anything nicely amenable to analysis.