The time required to perform the transfer will be determined by many factors, including but not limited to:
- how much data must be transferred
- the speed/throughput of your internet connection
- the speed/throughput of your WiFi network
- server loading; assuming an iCloud backup, Apple’s regional servers may be busy
The only aspect that you may be able to directly influence is your WiFi network. You should note, however, that the slowest item in the chain will ultimately be the limiting factor.
During the transfer process, keep both devices connected to their respective Power Adapters - as this will keep the WiFi radios active.
These support pages should get you started with setup of your new iPad - and the methods of transferring your data from old to new iPad:
Set up your iPhone, iPad or iPod touch – Apple Support
Transfer data from your previous iOS device to your new iPhone, iPad, or iPod touch - Apple Support
Use Quick Start to transfer data to a new iPhone, iPad or iPod touch – Apple Support
If the donor iPad, from which you are transferring your data precedes iOS12.4, QuickStart will not be available.
“Transfer” is rather a misnomer. In reality, your data and setup is merely cloned to the new device. Nothing is moved or removed from the original device.
An alternative is to restore either an iCloud or iTunes backup to the new device:
How to back up your iPhone, iPad and iPod touch – Apple Support
Restore your iPhone, iPad, or iPod touch from a backup - Apple Support
Be aware that Apps are not directly transferred between devices. For Apps, the transfer process creates a record of the Apps that are installed on the source iPad - and it is this record of installed Apps that is transferred to the target (new) device. For Apps that are still available for download from the App Store, the corresponding Apps are automatically downloaded and installed from the App Store.
If you need assistance, you can make an appointment for the Genius Bar of your local Apple Store or Apple Authorised Service Provider (AASP) here:
Genius Bar Reservation and Apple Support Options - Apple
