I’ll often read a bit before going to bed, so super long chapters (e.g., greater than an hour?) mean I’m just choosing somewhere “less intentional” to stop.

I would also say that I recall (it’s been a while!) a lot of extraneous detail in some passages, that made me think “ugh, I kind of wish I could skip this, but if there’s a hidden plot element in here I shouldn’t”.

The extraneous detail was probably more frustrating than “long chapters”, but I find that the two go together and usually suggest a missed opportunity for editing.