The ipad2021 supports a 20w fast charge, which takes about an hour and a half to fully charge, a built-in 32.4 watt-hour lithium polymer rechargeable battery, up to 10 hours of web browsing or video viewing using a wireless LAN, and charging via a USB-C connection to a computer or power adapter.
Ipad2021 adopts A13 bionic chip, equipped with 10.2-inch (diagonal)LED backlit multi-touch display, is not complete full screen, adopts IPS technology, supports 2160x1620 pixel resolution, 264ppi per inch pixel, uses anti-oil and anti-fingerprint coating, supports Apple Pencil(first generation).
About two and a half hours
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The iPad Air 4 has a built-in 28.6Wh battery and comes with an Apple 20W USB-C power adapter, which takes about two and a half hours to fully charge.
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The iPad Air4 uses a 30w charger, and generally about 30% of the battery is charged to the full state, which takes about three hours.
If you go into the fast charge, it's about an hour and 20 minutes.