From what I remember TheFluff was arguably one of the best timers (and encoders) in the fansub scene in the past and he could time the dialogue in under 10 minutes. https://www.youtube.com/watch?v=00xX0PwGUg8
Karaoke and typesetting can of course take longer (I remember someone complaining about how much effort it was to typeset every single book name in some scene that had a bookshelf) though karaoke is usually ~3 minutes of unique content (OP & ED) per ~12 episodes. Typesetting depends heavily on anime, like isekais don't usually have a lot Japanese writing anyway.
> I remember someone complaining about how much effort it was to typeset every single book name in some scene that had a bookshelf
That seems like something you might legitimately skip. Most books that appear in the background of a scene aren't relevant.
On the other hand, the example image in the article, where there's a big banner hung on the wall reading "Rana-chan's Surprise Party", seems like something you'd want to translate.
I'm frankly puzzled by this meme. Only Bakemonogatari is sensitive to timing, and not in a good way, the rest is a matter of habit and taste, so you can't improve it.
Karaoke and typesetting can of course take longer (I remember someone complaining about how much effort it was to typeset every single book name in some scene that had a bookshelf) though karaoke is usually ~3 minutes of unique content (OP & ED) per ~12 episodes. Typesetting depends heavily on anime, like isekais don't usually have a lot Japanese writing anyway.