24 hours isn’t easy on a Dover ferry, but is quite possible elsewhere. The old Bari and Brindisi ferries were not quick, and the Superfast out of Ancona covered a lot of distance in 24 hours. Bilbao and Santander are over 24 hrs.
Sicily / Genoa is another one. I’m sure others know more, so it’s not that rare I think.
On your first point…
Sounds more like a philosophical debating point than an interpretation of the rule book to me, mate.
Sorry! [emoji2]
Sent from my GT-S7275R using Tapatalk