how long do you need to first charge

Thank you for your question. I'll do my best to assist you.

Until it says 100% charged. Charging your iPad will normally take about an hour but sometimes depends on your iPad's performance. If you have some apps running on it, it will take more than that, as it still uses the power. So try closing those apps or turn your iPad off completely while the charger is connected for that to charge faster.

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Thanks again.
Glenn