You may start your journey at any of the Hop on Hop off points! Simply hand your voucher to the driver in return for your ticket.Your ticket is valid for at least 24 hours so if you start your tour at 2.00pm in the afternoon you can use the tour until the same time the following day.The first bus departs at 9:00am and from then on buses run approximately every 15 to 30 minutes depending on the Tour Loop and traffic.Last departure time is at 5pm for all Day Tours. Bus frequency is subject to traffic conditions and cannot be guaranteed.One complete loop lasts between approximately 1hr 15mins and 2hr 15mins.During the Rock n Roll Marathon event held in the Nation's Capitol every year there will be several road closures as well as street detours being conducted in Downtown Washington D.C. Unfortunately the Company has no control over these road closures and we will be doing our best to ensure that you still have an opportunity to explore the city of Washington DC.We hope that these road closures do not inconvenience you too much and you can still enjoy your experience with Open Top Sightseeing.