[whswhs]

It could be spelled out more explicitly, but what I had in mind was that (a) Rapier Wit produces an Affliction, which would of course have the standard duration of 1 minute per point of failure; (b) the duration of the Afflication can be enhanced, perhaps all the way to Permanent (but the effects can be set aside with a suitable quest); (c) mental stun is a side effect and has its normal duration. So you might have a few seconds of stun but then a few minutes of itching, vomiting, or paralysis.