@Ike79:
It's 3.5 chapters actually, half of the first chapter is Abdul meeting the rest of the group. There's no way they can extend it to two episodes without heavy filler. So they might go all out and heavily change the fight, personally I won't complain.
It's not quite 3 and a half chapters for High Priestess. The reveal of the sub happens on page 8 of the chapter, so there are 10 whole pages left in the chapter, so there's a bit more than half to adapt.
Also, while it IS only ABOUT 3.6 chapters for what's left High Priestess by itself, remember that the first chapter of "Iggy the Fool and N'Doul the Geb" has practically nothing to do with N'Doul beyond lightly teasing him at the end of the chapter. That ENTIRE Chapter is taken up by introducing Iggy.
If we add that chapter to it, now we have 4.6 chapters to adapt into two episodes and as well.
Now, the 2nd chapter of the Iggy & N'Doul arc also happens to start with some more explanation and setup. Up to page 4 is a lot of really good exposition that sortof sets up the status quo they have entering Egypt. It establishes Iggy as a member of the team, It establishes they only have 2 weeks left, and it establishes that they have 9 new Stand users to fight. The next 4 pages ending on page 8 ends with a tease of N'Doul as he kills that fly before cutting to the Joestar party driving towards Cairo.
IMO, this is the absolute BEST moment to end the episode and it fits perfectly. If you add those 8 pages, then we have exactly 5 chapters worth of material that can be adapted into the two High Priestess episodes. If they want they can also pad it with a bit of filler including maybe even showing us Midler since she HAS an Araki-drawn character design thanks to the Heritage for the Future Arcade/PS1/Dreamcast game, but you otherwise don't get to see her in-series at all. All in all, I think High Priestess should be taking up the first High Priestess episode as well as the first half of the second, after the eyecatch should be the Iggy stuff. A good cliffhanger to end the first High Priestess episode on I think would be the moment where you get that zoom out of the underwater face right at the end of the High Priestess Part 3 manga chapter.
But if they do what I'm saying here (Which is really what I've been advocating for a while) then it's the PERFECT ending point for the season. That way we have the entire status quo for the next season laid out as a tease, PLUS if they want they can include that last 4 pages and tease N'Doul as their first fight next time and it'd work perfectly.