While in the fragile state of underlying insanity (after
the initial bout of madness has passed) any further loss of
Sanity points (even a single point) will result in another
bout of madness. This mental fragility remains for the full
duration of the insanity—1D10 hours in the case of temporary
insanity—and probably for the duration of the scenario or chapter
of the campaign in the case of indeﬁnite insanity.