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. 😊