I heard this morning that the guards at the coffin stand motionless for six hours. Unethical. The rule should be to stand for two hours.
You can watch the thing live. Quickly running through it they had a changing of the guard at one hour. I might have fast-forwarded through a change, but one hour sounds reasonable.
Well - for a guard. I doubt that I could stand motionless like they do for more than 10 minutes.