When will One Piece finish?

Probably between 2024-2025. If one Piece were really going to end in 2024, that would mean that at Oda's current pace, the story would be ending around Chapter 1136, 94 chapters from the one releasing tomorrow. Comparatively, if Oda had mantained his 39 chapters per year rhythm in 2020 and 2021, the story would have reached chapter 1162 by the end of 2024, meaning 120 chapters from the one releasing tomorrow. Since we're talking averages, its not precise, but Oda’s change in pace has set him back at least 30-ish chapters or 1 year from his estimated end time. Meaning that by this estimate, One Piece should end in 2025.... right?

How is One Piece storytelling?

Oda intently focuses hard on specific characters and goes into their back stories as they were children so that we can truly understand their crazy mentalities as adults. It's so deep and yes sometimes very poorly paced but ultimately he doesn't want you to just see all the bad guys as simply "bad guys" but understand their perspectives of where they came from mentally as to why they are the way they are.