Is it common to map multiple API entities are mapping to the same underlying Resource Server - just with differing JWT expirations? For example, multiple API entities mapping to api.mycompany.com?
The API defined in Auth0 is an abstraction. It is not necessarily tied to a real API.
So yes, this use case is fairly common.
Just make sure your real API verifies all access tokens properly, enforcing the different security contexts (of the different Auth0 APIs) properly.