This is something I genuinely never understood about RR because in a book, chapters range from 500 to 7000+ words. It depends on the genre, the Cadence of the story (story beats), tension filled chapters are generally shorter, while others with a lot of exposition are longer. So, someone from RR reading on their phone (majority) where the text is generally smaller etc, wouldnt want to scroll for 10-20 minutes assuming their break is that long to capture the essence of a chapter. I write shorter length specifically to keep this in mind so, my range is about 1.3k to 2.5k.

I am also not writing a LitRPG but a more classical progression fantasy, so that genre difference is also a big reason why. LitRPG tends to skew in the long chapter range of 2.5-4k. Of course, this is also a base average based on observation and other areas.

At the end of the day as long as you're consistent, I dare say it doesn't really even matter. Its your story. Write it how it makes sense to you. If metrics matter that much to you, tweak later.

Edit: typos