Transfer data from one iPad to the other iPad
How long does it take to update the new iPad iCloud settings from the other iPad?
The actual settings will transfer very quickly - your data, however, may take a little longer.
The total time to migrate data and settings from one device to another will be influenced by the overall size of the dataset - and the method used to transfer. Data transfer can be from iCloud or iTunes backup, or QuickStart.
More information can be found in these support pages:
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
I hope this information proves to be helpful to you.
