UNDOCUMENTED MECHANICS
Stuns for 50 frames (+5 per level), about 2–5.8s.
"Chance to convert" above follows a diminishing curve, not a flat gain per level; the other numbers in the same block do not: 18% at level 1, 27% at 5, 32% at 10, 36% at 20, 40% at the limit. Reaching the limit takes skill level 60, gear bonuses included, so the first few points are worth far more than the last ones.