I would charge it for the amount of time you usually do until the power bank is fully charged. After that try using the power bank to see if it charges your device. If it doesn't charge then your power bank probably broke and i would contact the company of which it was made from. If that is the case you might want to try getting one from a different company. This technology review site has a lot of them on their site and they test and rank them on how well they work so you might want to check them out.
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