How long does it take to replace iPad Pro battery ?
How long does it take to replace ipad pro battery ?
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iPad Pro, iPadOS 16
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For practical purposes, in lieu of replacing the battery and returning your own iPad, Apple usually exchange the iPad for a renewed/refurbished iPad of the same model and specification. The cost of the exchange is the same as would otherwise be charged for the battery replacement.
As for battery replacement cost, you can verify eligibility and cost for your region/country here:
iPad Repair & Service - Apple Support
If performed in store, if an exchange device is available from stock, the change-over is very quick. If a replacement device needs to be ordered, the process is often completed within a few days.