For release 000F (for Hardware Version 1.0.0) and release 000E (for Hardware Version 1.0.1) upgrade time for Android phones is approximately 10-15 minutes. Upgrade time for iOS phones is several hours (therefore, nighttime upgrade with the phone attached to a charger is recommended). The long upgrade process is due to the Bluetooth connectivity framework on iOS and how our headset functions within it. Our developers are working to reduce the amount of time needed to perform the upgrade.