How many hours of battery life will the Sony WH1000XM3 provide

Great Bluetooth headphones are no good if they can

Sony wireless headphones with 30-hour battery life cheaper than Currys, Argos & John Lewis with £47 off on - MyLondon

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Sony WH-1000XM3 Industry Leading Wireless Noise Cancelling Headphones, Bluetooth Headset with Mic for Phone Calls, 30 Hours Battery Life, Quick Charge, Touch Control & Alexa Voice Control (Silver) at Rs 12600

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