I mean I have read stories that were 2 hours long to only a few minutes and my opinion is that short episodes can make you feel as though “What was the point?” I didn’t time my chapters but I know my 2nd chapter was at least 9 minutes without all the alterations so I hope that my chapters are a good enough length. I understand why it might be difficult to make a chapter have scenes that aren’t just “fluff” to stuff into there but I always say timing it is the best thing you can do. If you wouldn’t read the length of your chapter since it is too short/long then try re thinking and go back to the drawing board. Think about events that need to happen and ones that don’t and how you can fill in details to make your length better. I added a scenes that were never supposed to be there and it made it so much better in my opinion. If you need to plan then do it.
In conclusion, write however much you feel comfortable with but try and add something that will become important to the plot in the end you will thank yourself and your readers will thank you.
Now back to my opinion on actual length based on being a reader on episode consistently since last year. I read a story that was two hours long almost every episode and although I loved the story I would go out and back into it after awhile since it felt like it dragged sometimes and I knew I had to make actual time to read it. So really long episodes are fine but having to re read them is a bit annoying. But on the other side reading short episodes I think that 10- 20 minutes is good amount of play time. I am currently reading a story like this and the author has had complains from readers but her reasons are because it is where she feels most comfortable and maintain motivation. Which I can understand and I can do this between breaks and finish it. Which is much better than having to stop and start.
So I don’t mind reading long stories but shorter episodes are better but I don’t mean a few minutes (example - 2-5 minutes) I mean 20 minutes are best to keep my attention and also feel as though I haven’t wasted my pass. Length could depend on the story though like comedy shouldn’t go on for longer than a generic tv show (30 minutes) but some stories will need a longer length like drama ones. 