If you google around a bit you will probably be able to find this Nature article downloadable for free …
30 years it gives. Thirty. That’s one generation by some calculations. That’s how long we can expect a cultural memory of John Lennon to (have) last(ed) by oral communication alone. After 30 years the memory needs a written communication in order to survive.
I don’t know how that little bit of research finding will feed into studies of “oral tradition” and “memory theory” related to Christian origins. I’ll have to take some time to master the various definitions and concepts of the Nature article and only after that will I feel I might be in a position to think through any implications.
Others may be well ahead of me in this regard, however. I’m open to learning something new.
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