>> Hays established a “Three Second Kiss” rule. To get around it, Alfred Hitchcock had his actors stop and restart their kisses every three seconds, and thus, by technicality, got away unscathed with making the kiss scene in between Cary Grant and Ingrid Bergman in “Notorious” (1946) over two minutes long.
https://www.messynessychic.com/2019/07/16/hollywoods-doom-book-and-other-tales-of-blacklisting-in-american-cinema/