I first wrote......I don't know the times of things, but the princesses rotate in and out rather often. So while you will never know what princesses you might see when it's your turn, I don't think there's ever a time while it's open that there are NO princesses.
I do remember that the storytelling times and the coronation ceremony times are listed....
And then.....Oh hey, wait. I have some Times Guides in my "disney drawer" in my organizer here (I have a little corner of the living room with chair, laptop, etc), and now this is from the December 7-9 2007 Times Guide, so I have NO idea what sort of help it will be for a future visit. The hours those days for DL were 8am to 12am.
And the "Royal Walk" was open from 9 to 6, with Royal Crafts during that time. The Coronation Ceremony was at 10:10am, 11:15am, 12:20, 2:15, 4:15, and 5:15pm. The Princess Storytelling was at 10:40am, 11:50, 12:50pm, 1:50, 2:40, 3:00, 3:50, and 4:45pm.
So that's just an idea of the sorts of times they have things.