The official website for the third season of the anime "The Rising of the Shield Hero" (Tate no Yūsha no Nariagari) revealed that it will have a total of 12 episodes.
Therefore, these same 12 episodes will be compiled into three Blu-ray and DVD volumes.
The Rising of the Shield Hero – Season 3 has its number of episodes defined

Synopsis
The story revolves around Naofumi Iwatani , an otaku who spends his days playing video games and reading manga. One day, Iwatami is suddenly summoned to a parallel universe! He discovers he is one of four heroes equipped with legendary weapons and tasked with saving the world from its prophesied destruction.
The first season of The Rising of the Shield Hero aired in 2019, consisting of 25 episodes. Crunchyroll streamed the anime as it aired in Japan.
The film is directed by Hitoshi Haga at Kinema Citrus studio, with music and screenplay by Keigo Koyanagi.
The Rising of the Shield Hero 2, the second season of the anime, premiered on the AT-X channel on April 6, 2022.
Source: Official website
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