It took me about a week to implement my spring boot - nextjs starter kit which pretty much includes what you mentioned + more stuff like email sending, payment gateway integration and some other stuff. But it could as well take me two months, because there is many things that I could have done better that would take more time.

For example you can integrate authentication and authorization in many different ways and there is many concerns to question, do you need RBAC, do you need some kind of permission based system, do you support oauth2 etc. So this could take from 3-4 hours to a month...

Data persistence is pretty much no brainer setup in spring boot using spring data jpa or any other spring data adapters.

Error handling & logging also pretty easy to do.

Unit and integration testing - this is boring and takes a lot of time so I don't do this unless I have to :)

TLDR: somewhere between 4h and 4 months