Speed 17-19 km/hr touring. Unloaded I get along at around 24-28 on anything over 50km
It depends a lot on how far you are going and how hilly/windy it is. If you only have 90km to cover you can push yourself a lot harder and have much longer rest stops than if you have 160km.
I take hills very easy. 7-8 for the steepest. Don't go crazy on the downhills, though it is fun!
I usually spend close to 8 hrs on the bike. I try to get to where I am going an hour before sundown and time my afternoon stops accordingly. It is nice to stop for a coffee every hour in the afternoon when you are not in a hurry because you got going early and covered 100km before lunch!