Post Office – Orkney, Birsay – Opening Hours & Branch Details Post Office is easily reached on Palace Stores, approximately a 16.25 mile driving distance north-west from the centre of Orkney (by Saint Magnus Church). Today (Friday), business times start at 11:00 am and continue until 12:30 pm. This page will give you all the information you need about Post Office Orkney, Birsay, including the working hours, address info, direct contact number and additional essential details.