How many hours do EPIK teachers work in Korea?

Excuse me, could you please clarify the working hours for EPIK teachers in Korea? I'm curious to know if they follow a standard schedule or if there's any flexibility in terms of their working hours. Are there any specific requirements or regulations that they need to adhere to when it comes to their working hours? It would be greatly appreciated if you could provide me with a brief overview of their working schedule and any relevant details. Thank you.