I imported all my pictures of my last 10 years into my new iPhoto library in my new iMac. It has been a few day, computer is on, but iPhoto still has 0 photos analyzed and I don't have any people tagged. Can you please help?

Hi

What format is the external drive?

It must be formatted APFS or MacOS extended (journaled) (preferred for spinning drives) and not case sensitive.

It Must not be (or have been) used for time machine. (A time machine drive can be used if re-formatted)

It must be able to have the 'ignore ownership" checkbox ticked.

It should not be on a memory stick, SD or similar.

It must also not be a network drive (a direct connection is required - eg USB or Thunderbolt). File sharing services such as iCloud Drive, Drop box, Onedrive etc are not compatible with Photos libraries.

See

https://support.apple.com/en-gb/HT201517

If it is already set up correctly , then there is no limit - but with 10 years of photographs to go at it is going to take some time. Expect weeks - or even months, rather than days.

I've a similar issue since the update to Monterey.

My library was unable to finish the analysis on Big Sur (22496 photos on MacBook Air 2019 i5) and after the upgrade to Monterey seems stuck at analyzing with no progress.

I can search for month and season (spring, autumn...) but unable to go any further several month after the upgrade.

I've done two times the repair of the library and I don't want to do a massive export/import to the library trying to fixing an issue that pursued Apple Photos since my migration from beloved Aperture...

Try leaving your Mac on overnight. It is unclear what gets it started, but at some point photoanalysisd will start chugging along and do all its indexing.

Same 6,090 analyzed and 70K to go for days now. Seems strange can initiate starting the process of analyzing.