Un o'r amodau hynny yw na ddylai'r gweithiwr dreulio mwy na 183 diwrnod mewn cyfnod o 12 mis yn yr Aelod-Wlad y cafodd ei (h)anfon i weithio ynddi.
This is subject to certain conditions, one of which is that the time spent by the worker in the Member State to which he or she has been posted should not exceed 183 days over a 12 month period.