iPad Air 4 is bent after couple of hours of usage

Either search online to locate and call contact your nearest, “local” Apple Store location to try/attempt to make an appointment to get your Apple iPad Air 4 diagnosed and options presented

OR, failing that,

Contact Apple support via the contact support link located at the upper right hand corner of every Webpage of these Apple support communities.

Use the Device Damage & Repair category.

OR

by installing and using the Apple Support app found in the iOS App Store.

Tap the iOS App Store link below.

https://apps.apple.com/us/app/apple-support/id1130498044

Either way, there is a strong chance that you are going to be in for an expensive device replacement.

When it comes to bent iPads, cracked screens, it is up to the user to provide absolute, incontravertible proof that such things were not user inflicted and are a manufacturing defect.

Here is what you may expect to pay without paid AppleCare+

iPad Repair - Official Apple Support

Sorry & Good Luck to You!

please go to this link<https://support.apple.com/ipad/repair/service>

Was this iPad a recent brand new purchase or have you had this iPad for awhile?

Did you purchase extended, two-year AppleCare+ for this iPad Air 4?