The amount of time it takes to charge the battery on eufy SmartDrop T8790 solely depends on the type of charger being used. Please refer to the following details:

If the input voltage is 5V 1A, it will take approximately 8 hours to fully charge the battery on eufy SmartDrop T8790 from 0% to 100%. On the other hand, if the input voltage is 5V 2A, it will take approximately 4 hours to fully charge the battery on eufy SmartDrop T8790 from 0% to 100%.