>>961703>>961709>>961721>I can't do something therefore no one can250 miles is what ~400 km, to make the math simpler let's go with 400 km for this example. 25 km/h is a reasonable pace that can be easily kept for an entire day, even if you're carrying your own food and water. With support vehicle carrying all your stuff maintaining 30 km/h on a decent road bike shouldn't be too hard for anyone that's relatively fit. These numbers obviously assume flat roads.
With 25 km/h pace riding 400 km would take 16 hours. That doesn't obviously include breaks. A good rule of thumb when hiking is 55 minutes of walking, 5 minutes of rest so let's go with that. It's important to remember to eat and drink enough, your body can keep going as long as it has enough fuel. Let's take 4 proper food breaks of 30 minutes to eat proper food on top of all the snacks. So that makes 16 hours of riding, 2 hours for food, ~1.5 hours of smaller breaks. 400 km should be comfortably achievable in 20 hours.
Even if you bring down the speed to 20 km/h it's still doable in under 24 hours. Now it would be 20 hours riding, 2 hours eating, 2 hours on smaller breaks.
He didn't even originally mention it was within 24 hours so even if you're REALLY slow it's achievable as long as you remember to keep eating and drinking all the time.