The short break procedures are only to be taken when air traffic activity is minimal and not requiring air traffic controller action for the separation of aircraft. As the relieving controller is required to reply with phrases, such as 'STAND BY' or 'WILL ADVISE' only, safety is likely to be maintained albeit at the expense of efficiency.
Yer, right, nope.
"centre xxxx requires 20nm right of route due weather"
"STANDBY"
At say 8nm/minute and statistically a minimum of 10 minutes for the brains trust
to have a dump and transit back to the work station (2mins) is say 100 track miles.
I call bulldust on "safety likely maintained".
"Likely"infers a probability and we should not control airspace on the same basis as a toss of a coin.