Question: is 50 km a long bike ride?
Answer: If you are riding 20 km/h average on your bike (without a break), you can even finish it in 2,5 hours. The normal speed of a bicyclist is about 10 km/h and say you and your friends take a break in the meantime, you and your guys arrive the destination in about 6 hours, still less than 8 hours.