When I tour I will ride for a couple of hours then take a break. Average is what you make it, looking back over the years I would guess my average would be in the 40-60 miles per day range. One tour the worst day was about 25 miles and that took around 6 hours of riding, battling brutal head winds. The best was over 120 miles in about 6.5 hours when we had a 35 mph tail wind on a long straight road. I have a tendency to want to stop and see things along the way. One recent trip I took we averaged 35 miles a day and it took us 8 hours to cover that with all the stops we kept making.

I think our longest time in the saddle was maybe 90 minutes

...if that.
Aaron