An update:
I just passed a B2 comprehension test. 20/20 for listening and 17/20 for reading. I wasn’t super confident in all my answers, but I still passed.
https://eclexam.eu/sample-test-italian/
My statistics:
Known Words 13,224
LingQs 32,989
LingQs Learnt 7,496
Hours Listened 474
Words Read 1.527M
Hours Speaking 22
Plus the small amount of Anki I did back in the day. I haven’t touched Anki since.
Some of these listening and reading has been from TV shows with subtitles. When I used subtitles, I imported them into LingQ and added the Known Words.
Also, I record speaking as half or two thirds of a conversation.
The new level for Intermediate 2 in Italian is 17,280 Known Words. By the time I get to this, I suspect, I’ll have a solid B2 level, as opposed to my early B2 level.
EDIT: I think I estimate this to be about 700 hours in total.