I couldn’t find any back-to-back shows that I marched (in the early 90s) that were in the 600 mile range, but I did have a fair number over 300 and a couple over 400.
For example: In 1991, Sky Ryders performed in Phoenix on July 9 and Albuquerque on the 10th, which was a little over 400 miles in travel.
It wasn’t all the time, but we did on occasion.