The best advice I have is: a chapter should be as long as it should be.
That is totally unhelpful though!

I would certainly say that in first draft, don't worry about it. Write. Get it all down. Worry about breaking it up later. When it comes time to worry about it, there are a number of ways to approach it. You can go the "chapters all about x length, find a good breaking-off point around there". You can break it up wherever feels right without worrying about how long it's been - and that's fine. I've read and enjoyed books with chapters that varied in length from 20 pages to 3 words. (And that three-word chapter was a very effective chapter!) Or you can not break it up at all. Terry Pratchett almost never has any kind of separation beyond scene breaks, and it's fine.
Personally, I find my chapters come more or less organically from my planning process, inasmuch as I plan out major beats of the story (say, ten major plot/turning points to the whole novel, each leading into the next) and each of those becomes a chapter. I know the chapter is done when I've achieved the plot beat. Usually each plot beat takes around 3 or 4 scenes to achieve, and my scenes tend to be around 1-2k words, so I end up with chapters around 3-6k words. But that's just the way I go.
When it comes right down to it, how you chapter your story is like how you slice a cake. It has some superficial impact on the presentation of the story, but it doesn't really change how much the consumer enjoys it.
