If you do, you will automatically spend more time with it. I think the most important thing about learning new stuff is to actually enjoy doing this. Ofcourse you can push further, but it all comes down to one question: Will this still be fun for you? For me, 2-3 hours of learning new stuff feels in one session feels solid. I think this will ultimately end up the same but I can take breaks and process things whenever I want. That being said, I decided on an Udemy course to learn Javascript (they are often >90% discounted). From what I've heard, you will spend a few hours after each day to actually catch up and get a deeper understanding of what you've learned.

Only difference to self-study in my oppinion is, that you always have a teacher who pushes you, a group to discuss your approach with and the given time-frame of 8 hours you need to be physically present. The basic principle of these courses is to show you something and then leave it up to you or the group to solve an adherent task. What's the best way to learn is defined by what type of learner you are. I live abroad, but I think the concept should be more or less the same. I actually considering a bootcamp myself and ended up calling two bootcamps. I've started coding myself very recently.

Coding bootcamp reddit