Best dump hose length

We carry 3-10' sections, 1-20' section, and 1-3' section of 3" sewer hose. The short one is normally used with our portable waste tank, but we also use it when the other lengths come up just a little short. We have used 50' to reach the park connection a few times since we usually position the coach for the best view when there's a choice, rather than the convenience of the utilities locations. Years ago when we first started traveling in our motorhome, we carried just two 10' sections which was fine for most parks we went to then. Over time though, when we found ourselves needing additional length, we just scooted to the nearest Walmart or RV store and grabbed another 10' or so.