Give it time, leave the app open, but in the background minim9zed or in its own “Space”. It just needs time.
Sent from my iPad using Mac-Forums
A lot of time! My system took just over a month to do facial recognition of about 10,000 images and about a dozen people. But eventually it did finish. As Bob says, leave it running, in the background.
Heh! That's what Apple told me, too--a week. Took 4. Hope it works better for you!