I don't know the actual number of chords in the version of "Don't Mean A Thing (If It Ain't Got That Swing)" that my friend Thad taught me, but I do know that in one pass through you change chords 27 times and, if you're playing it "at speed" that takes about 21 seconds.
Yeah, it took me a bit of time to get up to speed on that one.
Francisco, I said it on YouTube but I'll repeat it here. Fabulous job!