What is the charge time for the 3D glasses?

• These are approximate charge and use times:
  • Charging for 50 minutes allows approximately 40 hours of use
  • Charging for three minutes allows approximately three hours of use
  Battery life may vary depending on the usage conditions and the operating environment. Also, the rechargeable battery deteriorates over time, which gradually reduces the amount of time the 3D glasses can be used between charges.
  
  Note: The battery is not fully charged at the time of purchase. Make sure you charge it then before use.