World of Warcraft Roaster Api refresh


Durring testing of an application that is using World of Warcraft rest-Api i noticed that Guild Roaster API is not refreshing instant. Can someone help me with an information about how often are those data available in rest-API after an in-game modification?

My own experience with this guild roster shows it refreshes anywhere between an hour and 12 hours. I don’t think it’s triggered by an ingame event (Such as a log out)