BS! How many times have you seen on the news where window washers/ roofers have scaffoloding collapse and they hang there(comfy and content as is possible in the situation) for hours waiting on help??? Happened just this week in Indianapolis. waist belts will kill you if left hanging there long at all.
It's called suspension trauma and it does happen. If you'd happen to be unconscious while hanging from a harness, it is very likely. It happened to a hunter not far from here last year. His young son found him, sad deal.
Suspension trauma, or orthostatic intolerance, is a natural human reaction to being upright and immobile, where a complex combination of blood pooling in the legs and cardiorespiratory restriction leads to unconsciousness.