Penalty for going to the toilet ...

[Jamillion]

But if I go to get a haircut, and there's a 25 minute wait when I walk in, I can put in my name and go next door and eat without losing my place in line.

An indefinite pause would be too easy to abuse, but a 5-10 minute hold wouldn't be unreasonable.

In the case of a haircut you're waiting on the barber who presumably knows how long he will take. With a duty queue you're waiting on other players. 7 people shouldn't have to wait for one.