We have now spent 11 weeks total in Florence and I have not come to the end of art and architecture I need to see there.
November is a good time to go --- last year, we were there from the end of October to the beginning of December. There were still crowds in some places, but mostly avoidable. Also, we flew in and out of the Florence airport (for the 2nd time) and it is so much smaller, quicker, and easier than the Rome airport.
The other nice thing about Florence is that you can walk everywhere. We were last in Rome in January 2024 and the buses were darn crowded.
Check out the art history classes at the British Institute of Florence --- I've taken almost all of them either in person or by zoom or both. Highly recommended! They do tours, too, which my fellow students enjoyed, but most of which made me impatient.
I don't know how similar 1982 was to the 1971 of my first trip to Italy (also art-focussed), but be prepared for having to make reservations and for dealing with greater numbers of other tourists --- there was an especially big jump after covid.