The schedule was probably more of an issue for you than the milage. Here in Canada there's still light from 4:30AM till 9:30PM. On tour I tend to take advantage of that and stretch the day: start early, stop often, carry very little food and don't bother with a sleeping bag. Set your own pace - one that you're comfortable with and you'll find that you can ride longer and fit more into a day (milage, activities, whatever) and feel it less.