I never did a "shakedown tour" per se. I rarely had the time, inclination or patience to do one. And now, living in Montréal, it would be difficult to find a nice camping destination within a day ride... unless I want to duplicate my tour. However :

– I commute a lot, oftentimes with panniers full of books, grocery, etc. I don't mind buying milk and canned goods at the grocery near work and riding the long way home, for instance. This means anything between 17 and 30 km in urban and sub-urban environment.

– I also do long evening and day rides, so my rear end is used to the saddle.

– I used to commute, do day rides and tour with the same bike. Now that I tour with kids on the tandem, I do some commutes and day rides with the tandem, both for comfort and to make sure issues are ironed out.