Question about Aukey Pb-P23

I tested the solar panel today. I measured 6V (open circuit voltage) 0.1amp (short circuit current) in evening sun exposure (0.5 - 0.6Watt). Probably a max 1 Watt panel. There is 118x70mm printed on the panel. Since the internal Lithium battery is approx. 60WH, it will take more than 60 hours of constant solar exposure to charge the battery from 0 to 100%.

At 8 hours of full sunlight, approx. 2500mAh are charged. It therefore takes about 50 hours for the power bank to be fully charged by the solar cells. The solar cells only serve as an alternative power source, and it is important to note that the solar cells are distributed over a small area.