Very productive when Apple tells me the iPhone will take 16hrs to transfer to the new iPhone, and you can't use it while it transfers.
Discussion
It should take less after all well depending if you are using the 1TB version then 16 hours maybe reasonable and of course depending as well which version of wifi you have at your disposal!
That's Apple for ya. Its the worst, and it always has been.
I’ve always been able to use my new iPhone almost immediately while it syncs in the background.
I think it has to do with how much data is on your iPhone. The transfer process must make a determination of which data it can transfer from iCloud and if that is the most efficient method. I also have some specialized apps which require downloading and storing additional large dataset downloads (400GB+). My suspicion is that this is what causes the long multi-hour migration process. In the future, I’m going to make sure to remove those apps and their data and just re-download those specialty datasets because my internet connection seems to be a lot faster than the bluetooth/wifi transfer that the migration process is using!
That's because NSA has to approve each byte.