Book clinic: what constitutes ‘well read’?

No two people’s lists are the same, but the Anglo-American greats and the ancient Greeks and Romans are all required readingSince it is seen as a great accolade for a person to be thought “well read”, I wonder what the minimum requirement might be to be considered thus?
David Handley, YorkshireRobert McCrum, author and former literary editor of the Observer
In 1618, two years after Shakespeare’s death, a well-read adult could easily load all the books they had collec