From my experience with the Shishun 18 Ticket one could easily get from Fukuoka to Tokyo and even further in around 12 hours or so. It's awful after couple of h

From my experience with the Shishun 18 Ticket one could easily get from Fukuoka to Tokyo and even further in around 12 hours or so. It's awful after couple of hours when you hit those smaller trains with benches that have not been replaced in decades but definitely doable haha