For my senior recital in college I performed Bach's Chaconne, the final movement in his Partita No. 2. It was 17 minutes long. (I can still remember most of it, too, I think.) The seeming endlessness of the Chaconne appeals to me, so I really like reels that have more than 2 parts and wind around the fiddle like a twisty mountain road. Tommy Peoples writes great tunes like that, and here's one. It was suggested to me by a youtuber who also plays the fiddle who knows I love a nice long reel.