The highway, which became one of the most famous roads in the United States, originally ran from Chicago, Illinois, through Missouri, Kansas, Oklahoma, Texas, New Mexico, and Arizona before ending in Santa Monica in Los Angeles County, California, covering a total of 2,448 miles (3,940 km).[1]http://www.stjo66.de/mileposts_1926.htm
Historic Route 66 is now approximately 2,278 miles (3,665 km) long and across 14 days, a person needs to drive an average of 163 miles (262 km) per day. If one drives at 45 miles per hour (MPH) on average, that would be approximately 3 hours and 37 minutes of driving each day. [2]https://independenttravelcats.com/2-week-route-66-itinerary-ultimate-american-road-trip/
It is generally accepted that Route 66 can be completed in two weeks. Ideally, however, you should spend a whole month on the road. In two weeks, you will only visit the most popular sites and major cities, necessarily connecting over Interstate highways to avoid busy downtowns and keep up your travelling speed. In one month, however, you will take our time to follow the historical route, avoiding Interstate highways as much as possible. In doing so, you could indulge in relaxed walks through historic, western-style downtowns, get lost between dusty antique items, sip a root beer in an authentic soda fountain, and enjoy an open-air movie before spending the night in an authentic pop-and-mom motel of the 50s. [3]https://www.route66guide.com/how-long-route66.html