most of my chapters are about 25 pages long - shorter than 20 i would consider short, 30+ i would consider long. i think id minimum a chapter to 15 pages, and maximum to 35. lately my chapters have been really long due to either longass scenes or additional miniscenes and its been lowkey stressful.
the thing with webcomics is, unless you have a hiatus inbetween, or you post an entire chapter at a time, they can seem perfectly continuous - so i think scenes being too long is more of an issue than chapters being too long. chapters being too long is more likely to exhaust you than a reader imo.
story wise, i try to keep a chapter down to one to three scenes (one big one or three tiny ones), and you want a chapter to have some kind of arc to it. that im not actually very good at rn. but a chapter should set up tension (ask a question), relieve tension (answer the question), and then bring up the tension again for the next chapter. i dont think you have to answer the question you asked, however - say you start with a scene from your villain, so the question is 'whats this dodgy fucker up to?' and then last chapter your hero got hit on the head, so this chapter your answer is 'it was the love interest that hit them, because theyre a clutz.' and then you set up tension to keep reading by revealing that the love interest is related to the villain, putting it in a circle that makes the reader feel like progress is happening.
that all could take three pages, or thirty - its scene length that you need to worry about more than chapter length imo. (disclaimer: i am TERRIBLE at pacing. i understand it in theory but get lost in the 'but i want my babies to do all the things' sinkhole)