Am planning a climb of Thunderbolt in August via South Lake, Bishop Pass, Thunderbolt Pass and Southwest Chute #1. I understand that at the top of the chute there is a class 4/5 section to gain the summit area. I want to take a rope for this section for protection on the way up and rappel on the way down. But to save weight I don't want to take a rope that is longer than necessary for the rappel. Does anyone who has actually done this climb know the length of that Class 4/5 section?