Outside of global wars, all war data is updated at XX:25 every hour, and continues for up to 10-30 minutes depending on PNW server load before everything is fully updated.
During globals, the update rate varies depending on server load and how quickly it burns out API keys. Expect approximately XX:25 every 2 hours for global wars.
Some updates may fail due to corrupted data or timing out when the PnW server is heavily loaded.