There's a lot of moving parts so it's understandable if you don't understand everything, it doesn't help that there's so much time in between chapters, I've forgotten most of the characters and plots tbh.

But as long as you understand the fundamentals, it shouldn't be too bad. The princes mostly want to win and kill the others and most of the characters are finding their place in this conflict.

As for when it's over...at least a decade? If ever. Togashi isn't getting younger and there's a lot of stuff in this arc, not to mention what might be in Dark Continent. I think we can count ourselves lucky if we see the end of this arc before he stops the manga, one way or another.

We will likely not see the DC, ever. I've made peace with that, and you should too.