>How do you ride a bike for hundreds of kilometers?
In many parts of the world, you would take a train or other forms of public transport to travel distances too far to ride by bike. Those often have last-mile problems when the train doesn't go quite where you need it to, but given sufficient density at the source/destination bikes are an effective solution to the last-mile problem.
Of course, in the US, we typically have sprawl at the source/destination, unsafe infrastructure for bicycling, and often not-very-useful public transport, which does rather limit this option.
In many parts of the world, you would take a train or other forms of public transport to travel distances too far to ride by bike. Those often have last-mile problems when the train doesn't go quite where you need it to, but given sufficient density at the source/destination bikes are an effective solution to the last-mile problem.
Of course, in the US, we typically have sprawl at the source/destination, unsafe infrastructure for bicycling, and often not-very-useful public transport, which does rather limit this option.