> Nobody today can memorize an epic like the Illiad today like people routinely would in Socrates' day. It a bit impressive if you can reproduce a 3 minute song text from memory. The Illiad often took days to recite.

AFAIK this isn't something that was very common back then. Reciting the Illiad was not a hobby but more like a paid profession. People paid for this precisely because reciting something for a few evenings from memory takes a lot of skill/training and most simply couldn't do it. Same as today.