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With the tablet turned on? Probably not a problem. It's a charger, not an external power supply for the tablet. A lot of the current coming from the charger is being used to run the tablet, so the charging is going to be slow. (A lot of chargers can't supply enough to chargew the device when it's turned on, so plugging in the charger jusr discharges the battery slower.)
It it's taking that long to charge with the tablet turned off there might be a problem.