Usb Massager

I have a USB Massager and when I plug it in I do not know how long to have it Charge for.
https://www.amazon.com/gp/product/B01N4WTMGN/ref=oh_aui_detailpage_o00_s00?ie=UTF8&th=1

They tell me till the Light stays Lit but I see no Light.

 

If you scroll down to near the bottom of that page, you will see 5 images of the purple model, the first two images show the lights.

If you don't see any lights, then it would seem yours is defective, or the charger itself is not working.

Generally, it is very rare these days to overcharge batteries. Properly working rechargeable batteries pull from the charger what they need, not what the charge is capable of delivering. So when a battery is fully charged, it stops pulling, except a tiny "trickle" to keep it charged. One reviewer said it takes 1.5 hours to charge. That is very fast - especially for the low cost of this device. I would probably just charge it over night.