How frequently are images freshly fetched?

[crusher11 191]

I uploaded a couple of posters to TMDB, but they're not showing up when I search for posters. It's just loading the cached results from my initial search before I uploaded the posters. How frequently does it clear this cache and go back to the image providers to check if there's anything new?

[Luke 24795]

It's going to be about a day behind.