How often does the information on the Pen Details page get updated?

The information on the Pen Details page is refreshed daily (in reference only to the Days since Last Sync and Days till Sync Required) however this also will update when your device has been synced as they reset. 

The information in the Dp DOCK section is updated when either a Firmware Update has occurred or when you manually change the Wi-Fi connection using the Wi-Fi Setup button.