GroupCacheDuration = 4 * DefaultCacheDuration // They don't change that often.
FileCacheDuration = 8 * DefaultCacheDuration // These change even less often.
+ // Used when a request uses a non-existing key (AID, ed2k+size, etc)
InvalidKeyCacheDuration = 1 * time.Hour
// Used when the UDP API Anime query fails, but the HTTP API query succeeds.