I have pre-soaked in water, for 12 hours, pinto beans, red beans, and kidney beans, and all of them take at least two hours of cooking to soften up. The hikers that were referred to, were probably carrying split peas or something else (not beans) in their canteens of water. Most hikers I know are pretty savey when it comes to the food they carry, and they would not be eating hard or crunchy beans.
Regards,
Mannyrock