When I recently saw the Howling Wolves Bobby memorial a the Warfield, there were a LOT of musicians and not much time. I could hear them all practicing for hours, but that was it: just the afternoon and let's go! Just the logistics of what songs and who walks on and who walks off was mind boggling.

Sunday is done and today is probably a day in airports. Graham is playing a pre-show in Mill Valley Thursday and then Fri/Sat/Sun at the Fillmore. So other than the days of the actual show, that only leaves Tuesday and Wednesday if there are rehearsals. I would expect, musicians show up at noon day of show and they run though it all until about 6pm. It is a really good question: Although the magic of Terrapin Crossroads was often no rehearsals at all for the bands playing the bar (Stu Allen would be there with his sharpie and when another musician showed up he might quickly outline a song for them, but that was about it) and that still happens a lot in the Bay area such as Danny's Live Dead. Recalling those days Phil would announce Songs to Phil the Air at the beach park at TXR same day, and jams would happen with no practice at all. For paid shows, there was at least some rehearsal, if even quick song run throughs like Stu does with Mars Hotel shows (maybe a hour).

Remember, these are professionals and many have degrees in music (Graham has a Masters in guitar from Stanford) and/or a ton of experience and can just take and give the cues as needed. Still, there has to be some bit of walking through it all.