Longtemps

Level 1 of the Dungeon
(6, 4, D:1)
  a +0 dagger
(18, 7, D:1)
  a +0 dagger (still there?)
  a +0 dagger (still there?)
  a goblin corpse (skeletalised by now) (still there?)

Level 2 of the Dungeon
(0, 0, D:2)
  a +0 whip
  a kobold corpse (skeletalised by now)
(13, 2, D:2)
  a +0 ring mail
(26, 16, D:2)
  a +0 dagger (still there?)
  a stone (still there?)
(26, 18, D:2)
  an adder corpse