Well you learn something new every day , I always assumed any break came off you wtd hours be it 20/ 35 mins or 5 mins , I’d of thought if the op had 12 mins break he could work for 6 hrs 12 mins before he needed a break
Odd if this is right as I’ve not had any infringements & ive always work it that way , I normally use poa , but have had the odd 10 min break & added it onto wtd hours before needing a break