Just finished TIWTBWO #5 about two hours ago, fwiw. Which is just in time to have a holiday season full of socialising and not much writing time to mull over whether I want to try the new thing I have been thinking on (long episodic SF novel starting nearish future and going into very deep future) or going straight into TIWTBWO #6 (which is one logical volume and the conclusion of the second arc, but bids to be long enough that I might split it into two physical volumes.)