To date, this is currently confirmed to be the second longest chapter in Brimstones and Broomsticks.
Trivia
Blooper: Originally Zee is shown using water magic against Eustace and Serpentina despite previous chapters, more specifically the prologue, confirming she lost said ability when she was branded with her sigil. The error was corrected sometime afterward.
What Could Have Been: Discord's appearance would've been about him messing with everybody with his shenanigans, but it was decided that those should be its own chapter, leading to "Battle of the Bands" evolving into a three-part chapter instead of a two-parter.
"Battle of the Bands" is going to wrap up Cross, Donna, and Lindsay's parts in B&B before they return to the Boiling Isles, leading into the beginning of The Adventures of LOWTH.
Payday is a free agent and her name is an alias, but this makes her real name The Un-Reveal.