[nehan looks up from chopping the rolled leaves, blade wet. that sounds like a very specific question from experience-- he already knows the signs, when all his students have asked such things of him so far. suffering from thoughts of "what if i could have done something to change this outcome?" because someone suffered or died from that one specific thing.]

It depends on the severity, and location, but typically minutes to hours-- and never more than a quarter of a day. Such things are considered an emergency and everything needs to be dropped in order to save the patient.