Sore butts are a common theme in cycling :) On longer rides people might prefer harder saddles. A softer seating clamps down on your soft tissue and prevents proper blood circulation. Having a harder seating will make you sit on your sit bones and have your blood flow free. The sit bones can start to feel a bit irritated after some time, but that is the time to get up for a walk. If your soft tissue (from lack of blood flow) starts hurting, it is because it is starting to get damaged. Even if you would walk for an hour and sit again, the pain would come back instantly.