How long can a Travelcube be operated after being fully charged? March 31, 2025 15:15 Updated A fully-charged Travelcube sound machine should be usable for at least eight full hours. Related articles How long does the Travel Mini battery take to fully recharge? My Hushh/Rohm/Travel Mini/Pocket Baby Soother will not turn on/off, and I have already made sure that the child lock is deactivated. How can I fix this? If the battery on a Travelcube is completely "dead", how long will it take to be recharged? Can I use my portable sound machine while it’s plugged in and charging? What do the indicator lights mean on the Duet Sound Machine?