I have a general rule of thumbs concerning the length of chapters.
Published novels often have chapters of approximately 5000 words, but the advantage of webnovels is that it is periodic, chapters will be uploaded regularly.
On that note, I expect webnovel chapters to be as long as you wait for them. A chapter everyday ? Then 1000 words is good, under that it's too short to really have a fleshed out scene.
Every two or three days ? 1500 words is great.
Once a week ? Then 2000 words.
Even rarer than that and it can climb up to 4000/5000 words like a general novel, but more than that and it's tedious to read on a screen, especially if you read on a phone.
As for the number of chapters, it doesn't matter as long as you write a compeling story that has a clear start and a clear end. Gatsby is a novel that has 48000 words, so if you write 1500 words chapters, it's 32 chapters. You don't need a lot as long as the story is good, but in the same way, if the plot is compeling enough you can chose to nerver end it.