Willy from Arlington, VA on 5/26/2016 7:18:14 PM:
I did the c&o/gap last September.
60 miles a day makes for a 6 day trip.
Its nice for just riding, but not much else.
If you want to stop and see anything for more than a glance (i.e spend time touring Antietam for example) you will find that you run out of daylight before the end of the day.
I might want to take another day or two and spend time along the trail for all the history.
That will also help if your conditioning isn't as good as you think it is.