[stefs]

> A multi-day race where riders can disregard stages will turn into a nightmarish competition of inhuman endurance.

i think the most famous example of this is the RAAM - the race across america (https://en.wikipedia.org/wiki/Race_Across_America): "In length the RAAM is comparable to the Tour de France, but the races differ to a great extent. The courses of both races have varied over the years. However, in the Race Across America, the direction has always been from the west coast to the east coast of the United States, approximately 3,000 miles (4,800 km), making it a transcontinental event. More importantly, the race has no stages, i.e., it is in principle a nonstop event from start to finish, with the fastest competitors needing slightly over a week to complete the course."