Personally ...

I like riding for 3-4 days in a row, and then taking a day off.

And I find 60-80 km/day, on the days that I ride, to be a comfortable distance.


That kind of schedule provides flexibility to be able to take a day off if the weather is particularly bad, or if there is something interesting to see. It also allows me to ride at a relaxed pace, to get a good night's sleep, and to stop in the middle of the day to do some sight seeing, or to arrive at the destination early enough to do some sight seeing there.