What are the limits of "AI Companion BASIC" for meeting transcriptions?

I have a "AI Companion BASIC" plan.

I recently started using Notes (which I think are stored in Docs), initially for manually taking notes, then I discovered meeting transcriptions. After starting a meeting transcription, after 30-40 minutes, the transcription ended. I read a post by someone that transcriptions end after 40 minutes for basic plan(s). On a later date, I tried to have (at least part of) a meeting transcribed, but it ended quite soon. Today I tried again, and was told I had hit my AI Companion limit.

1. What is the maximum amount of time a meeting can be transcribed with my plan (assuming I haven’t run out of AI companion usage)?
2. How is AI companion usage calculated?, or to put it another way, if I’ve had about 40 of a meeting transcribed (then cut off); then another one cut off even sooner; then transcription not even starting (out of AI companion usage), is that probably to be expected?
3. When I click “Upgrade” for “AI Companion BASIC”, the “AI Companion” plan mentions unlimited AI  note-taking, etc., but no mention of transcription (nor does the Pro plan). What is the minimal upgrade I need to have unlimited meeting transcriptions?
4. I am hearing impaired and used Closed Captioning which helps out a lot, but I still miss certain content, and having meeting text saved in a doc for my review is what I need to understand mostly what was said, after the fact. Since Closed Captioning is a live transcript of a meeting, as is the transcription feature, why can't I have access to the latter without paying extra? I feel I should not have to pay extra due to my disability.