PG seems to be putting it in very concrete terms. For example, he mentions spending only 8 Christmas with a young kid who feels it's "magical". 8, he argues, is

PG seems to be putting it in very concrete terms. For example, he mentions spending only 8 Christmas with a young kid who feels it's "magical". 8, he argues, is an objectively small number for lots of human experiences, like "8 books" or "8 times I dined my favorite meal".