My wife and I have been discussing if there can be too many POVs (technically PsOV but let's all relax about that) in a novel. I've read a lot of opinions on the subject online, but I haven't seen any steadfast rules, which makes me happy.
I myself tend to write in a larger number of POVs than what makes some people comfortable. The novel I'm currently working on has ten, but I haven't received any negative feedback from my beta readers.
To be clear, when I say ten POVs, that doesn't mean each of the ten get their own chapters. I will just show different POVs within section breaks.
Is there a consensus on how many POVs are too many from agents and editors?
Well, there isn't a consensus on the number of points of view you can have.
There is a consensus that all the characters need to be distinct, and the reader has to be able to follow the narrative.
Ten points of view would give me great pause.
Multiple points of view in a chapter would give me agita.
Now, let's make sure you understand what you're saying here.
Points of view, as I understand you are using it here, means ten different first person-points of view.
I am Spartacus kinds of thing.
An example of that is Chum by Jeff Somers.
All the chapters are in first person I. The reason I love this book,
and signed Jeff on the basis of this book, is that the reader is never
confused about who is speaking. Jeff is a truly brilliant writer and Chum is a masterful book.
If you are using third person (he/she/they) that's third person omniscient.
An example of this would be Crashers by Dana Haynes which follows multiple characters, but always in third person.
It's a whole lot easier to do write third person omniscient with multiple characters, than multiple points of view.
Don't bite off more than you can chew with your mouth closed lest that apple pie fall on your crisp white shirt and your dinner companion think you a slob.