The Wastes are a region of the Land of the Dead. All souls who enter the plane must pass through The Wastes, where they must overcome their innermost doubts and conflicts, or suffer the eternal consequences. Here, a person's demons take on physical form so that the soul must overcome them however they can.
Time in The Wastes varies greatly. Some spend over a hundred years; some take thousands; others may only take a few minutes; a few spend no time at all in The Wastes. The length of time is proportional to the magnitude of that person's inner turmoil.