A portable music player requiring 2.00 W is powered by a 3.7 V Li-ion battery with a capacity of 4000 mAh. The battery can be charged by a charger providing a current of 2 A with an efficiency of 84.0%. How long can the music player run on a full battery charge? (Round the final answer to three decimal places.) The music player on a full battery can run up to hours.

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