I am not sure what Una and Peregrine did immediately after that. You will have to use your imagination.
I always intended Sky Spiders to be about fifty parts long, mostly because I wanted to try and reach the NaNoWriMo goal of fifty thousand words (40,100 so far, including recaps and teasers).
Of course, I also always intended it to be driven by a barrage of escalating cliffhanger action. Exactly why the first of those goals seems to be coming to fruition, while the other degenerated into a meandering mess, is something to ponder.
In any case, this is now the longest anything that I've ever written, so I would say that my goal of making myself write something regularly has been achieved. Just a matter of pride now to actually reach some kind of coherent 'THE END'.