WinCC OA - Extended Services 1 hour. Includes 1 hour of Extended Services, available from Monday to Friday from 9 a.m. to 5 p.m. Outside of these times and on public holidays in Austria this is billed with surcharges. Services are only provided after an appointment has been made. The hours used are billed monthly. Unused hours expire within 36 months after ordering and are not billed.