A: This depends on your phone or device. SOLSOL™ has a power output between 125mA - 350mA. A regular wall outlet has an output of 1000 mA and a standard laptop has an output of 500mA. If it takes an hour to charge your device using a wall outlet, it would take 2 hours using a laptop and 2.7 - 4.0 hours with SOLSOL™. All these times are assuming you have a battery with 0% charge remaining. If you have, for instance, 50% charge remaining, the time to a full charge is much less. If you have partial battery and are using your device, you can avoid further battery loss by using your SOLSOL™ hat. Remember, you need to be in the sun for SOLSOL™ to function properly.