Mine are about 5K-6K.
People usually set their chapter length intuatively, but I think it is actually determined by reading speed and attention. I see a a chapter is one reader sitting. It should reward them for their time, and also point to the next chapter(s).
For example, IIRC the old pulp mistess Leigh Brackett's Ginger Star series has chapters comprising an actual scene plus section of mostly narrative summary (sequel/transition) where the implications of that scene become apparent.
SCENE: After a fierce battle, bandits take the party's mounts.
SEQUEL: Party traipses through desert, lost and running out of water. Just as they are about to expire, they see a golden dome on the horizon.