Miki Szeles
Everything related to test automation
No one can answer that because we probably don't know the course. Java's HUGE... I've been a professional programmer for 30 years and been using Java since the 1st beta. I worked on JVM code at Sun/Oracle also wrote one myself. Did practically everything in the Java realm...
I don't know all there is to know in Java.
Our profession is based on learning, adapting and understanding the depth of your own ignorance. When you start getting a sense of your lack of knowledge and how deep that hole is... That's the interesting part.
Wow, 80+ hours sound too much for me. I usually prefer 10-20 hour length courses.
What I definitely advise is to continuously practice your new learning, you can even submit it to GitHub, so you will be able to showcase your expertize on an interview.
Another piece of advice is to install Video Speed Controller Chrome Extension with which you can easily control the speed of the video (however I think this feature is already supported by Udemy).
I usually watch video courses with 1,5-3x speed, and whenever the coding part comes, I just pause the video and do the practice.
I highly recommend taking a course that is not a simple tutorial but builds up a real-life project from scratch. Those courses are much more valuable in my opinion.
I hope it helps. In case you have more specific questions just let me know. 😊