What do you mean by “through Roku”? If you mean stand-alone channel/apps, like the Discovery App on your home screen, then that is under control of the app-writer (Discovery) and likely happens essentially instantaneously. On the other hand, some content can also be subscribed to inside the Roku Channel App. In that case, you are running Roku’s app, and I really don’t know how that app interacts with the content providers or whether updates happen at the same speed with various providers.
I would generally recommend making accounts directly with content providers and signing into those accounts using their apps, because then you can contact them for answers. With Roku, it can be hard to find someone who knows anything, if you can get a response at all.
"Through Roku" means *not* standalone apps.
