The voyage still continues in One Piece, at least for a good while. The series creator, Eiichiro Oda, recently mentioned in an interview that 65% of the manga is finished. That is a 5% increase from his estimate back in 2012. Does that mean we have 28 years left until One Piece reaches its conclusion? Understandably, Oda also mentioned that he has no time for other long series, so maybe it won’t take quite that long.
The manga first released in 1997, spawning over 80 volumes since. Furthermore, the series has been running as an anime for over 700 episodes and counting.