Word of advice:
If you’re considering writing a chapter that runs 50–80k words… don’t. Seriously, just don’t.
Keeping chapters around 10k to 20k words is much more manageable. Anything much longer can make a story frustrating to read, and with that many words, it’s easy for both writers and readers to lose track.
Honestly, when splitting it into multiple chapters is such an obvious option, why not do that instead?
You’re free to ignore this, of course. I just hope it’s something worth thinking about.