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Re:Have Attention Spans Been Declining? – Yes, 65% by rypskar on Tuesday July 25, 2023 @03:22AM (#36859060)
Wasn't intermission because movies was on physical rolls (sorry, don't remember correct name) which had a maximum length and they needed an intermission to change roll?
Re:Have Attention Spans Been Declining? – Yes, 65% by mikestew on Tuesday July 25, 2023 @05:54PM (#36870115)
No, soft drinks sold at cinemas in the 60s were much larger than they are today, and no one could hold that much fluid for much more than two hours.

The answers you seek are here: https://en.wikipedia.org/wiki/Cue_mark, specifically https://en.wikipedia.org/wiki/Cue_mark#Use

And the answer to your question, as you now know, is still "no".