Ok let’s do the math

Chapter 11 - 35m
Chapter 13 - 47m
Chapter 14 - 33m
Chapter 15 - 38m

Overall - 153m

Subtract approximately 12 minutes for all the “previous on” and credits - 141m

Cut unnecessary / filler scenes, unsure of how much this could be so I’ll subtract 15 minutes to be safe - 126m

In that case, guessing Chapter 16 is 55 minutes - the movie would be max 181m. A three hour movie, but reasonable nonetheless. It could lower depending on how long Chapter 16 is and how much filler you could cut from the others.

I think it’s all possible in one movie.