SOURCE: How do I know when my Samsung Galaxy Tablet is
The Tab takes quite a long time to charge (not sure why). Note that the Tab cannot charge from a computer USB port (only from the included AC adapter. When the Tab has finished charging, it should put out a notification (open the notification drawer by pulling down on the status bar) saying the battery is fully charged and to unplug the charger. Other than that, you would have to install a third-party app like Smart Battery Monitor (see here) and watch that to see when it is full.
Hope this helps,
Alistair
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