The Transloetje can burn in the first light mode for approx. 20 hours, in the second light mode for about 15 hours and in the third and brightest light, for about 9 hours.
Be sure to unplug the Transloetje after charging the lamp from the charger. Turning on the lamp while charging it, is not good for the battery. The light will eventually get lazy and will no longer charge properly.