Re: 1/2 a dozen hours… I have recollection of pretty regular 12 hour sessions for several years: mixed in there were a few 20+ hour marathons. But my gut tells me that was balanced out by the five years or so we spent playing later on: I think most of our sessions the last five years or so were probably less than eight hours? But memory is a tricky thing…

Regarding how many they sell- I had the same question. I have felt like “traditional” gaming is a dying hobby, but I could be completely out of touch. And that table isn’t just for D&D or even RPGs: war games, miniature games, and related simulations all have similar “paper and marker” needs. I suspect, though, that the market is pretty thin: maybe a half dozen tables a year or something.