If the battery on a Travelcube is completely "dead", how long will it take to be recharged? September 30, 2020 14:39 Updated If the battery is fully depleted, the Travelcube will require between 3 1/2 to 4 hours to reach full charge. Related articles How long will the battery last on the Travel Mini Sound Machine? How do I charge my Hushh, Rohm, or Go? What do the flashing LED lights on the Travelcube sound machine mean? My Hushh sound machine won't shut off. Help! Do you have a guarantee or warranty?