One time I did the section from Streatley to Avebury overnight. 6pm at Streatley Late afternoon at Avebury, not sure of exact time. Took my time on other occasions as it is a great walk. Used to stay on the original Ridgeway but the new route over Smeathe's Ridge is very good. Hate off-road vehicles and tractors that cut up the wonderful turf. Always wild camped. Lack of water was one of the things making it a challenge but I thought that some standpipes had been installed.
Lived a few miles to the south of the Ridgeway for many years.