Hmm, some caustic answers.
I thought it was a great question. I hear tour accounts and read journals and almost always it's 'X miles, Y days'. Now, if they're destination cycletourists, great. If they're journey cycletourists but they're not visting local museums or distilleries or what have you or touring historic structures or gardens &etc. because they're afraid to take their eyes off their bike&gear, that's sad.
Back in the day organizations like the LAW and CTC pressed for cyclist accommodation, and places could get little signs or placks to display advertising they met some set standard. I don't know of any cycling advocacy organization today that has that in its mission statement.