The Collaborative International Dictionary of English v.0.48:

Long-sufferance \Long"-suf`fer*ance\, n.
   1. Forbearance to punish or resent.
      [1913 Webster]

   2. patient endurance of pain or unhappiness.

   Syn: long-suffering.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

long-sufferance
    n 1: patient endurance of pain or unhappiness [syn: long-
         sufferance, long-suffering]