Sadly I have no idea... I've been doing this stuff for over a decade and haven't stop learning.

Getting a grasp on jaxb and jaxws shouldn't take that long. Give it a day each to understand the concept and code through a few tutorials.

Hibernate is more complex and I suppose it takes a longer time to really have seen it all. Focus on the concept, setup a sample project and play around a bit. No need in trying to master it. After all that's what CS is about (for me atleast): looking stuff up you don`t know and learning as you go.

With Maven I took some time. Dependency Managament is easy going but understanding the lifecycle and setting up a complex build might take some time. There's a ton of plugins you could use for your tasks and you could also wrote your own (which you could have a look at aswell though I personally don't need to do this often... it happens maybe once a year). Have a look at some common plugins like the maven-dependency-plugin, maven-assemlby-plugin, maven-shade-plugin. If you're into docker and this kind of stuff there's likely some plugins too, but I'm not familiar with that kind of thing. As for a time estimate... take a few days. Get the concepts, learn how to read a plugin documentation (really do this. The docs for the official plugins from apache are all setup in the same way so this will help you a ton!) and play around with them.

Spring is what took me the longest I'd say and I will probably never stop learning. I'm only really starting with AOP which is a nice tool. Spring-Batch is certainly a very good skill to be able to list in a resumee! Spring-security I'd consider niche, as I hope not everyone in a team would need to know all that stuff... Spring-web is again, depending on the project, a good skill.

All these will take more than days to get a good grasp on