"Vince Hart" writes:
If it becomes necessary for the non-peeing player to accompany the
peeing player on his bathroom breaks, I suppose I would stop the
clocks until they both got back.

In most sane chess events, players are allowed to pee unassisted.
Since this event is insane and peeing players must be accompanied,
those exact same considerations should also require the non-peeing
player to be accompanied one way or another.