How long does the tour take? Red Route: 2 hours, 30 minutes (approx.) Blue Route: 3 hours, 30 minutes (approx.) Green Link: 1 hour (approx.)
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Long-distance Clara: London's longest bus routeLondon's longest bus route is the X26 from Heathrow to Croydon. It's 23.75 miles (38.22 km) long and it can take more than two hours to travel the full distance. The next longest is a night bus, the N89, from Erith to Charing Cross, at 23.3 miles (37.5km) long.
The reason behind their colour dates to the early 1900s, when the transport system was operated by different rival companies. London General Omnibus Company (or L.G.O.C.) owned most of the buses and in 1907 painted its entire fleet red to stand out from competitors.
While there are enough things to do in London to keep you busy for a lifetime, three days is enough to get a really good overview of the city. Focus on specific areas to avoid spending too long getting around, and make use of pre-booking and skip-the-line tickets to maximise your time.