Recently, Eiichiro Oda sat down for an interview with Gosho Aoyama, the author of the Detective Conan manga series. Oda talked about the future of One Piece while also confirming his plans for the series’ ending.
In the interview with Aoyama, Oda reiterates ONE PIECE is scheduled to end in 5 years and has the ending of the series completely planned. But, in the following statement, the author confirms that his personal goal is to end One Piece in around 3 years.
Oda also said that he had been pretty off with his predictions in the past, and he isn’t exactly sure this time either. Here’s the full extract from the translation. So no, it is not a fact that ‘ONE PIECE ending in 3 years’.