User blog comment:Torquil/Shokugeki no SOMA Wikipedia!/@comment-5601098-20131128184933/@comment-4530178-20131204090717

For shonen jump mangas, the least number of chapters that were released before an anime adaptation was made was 58 chapters (Hunter x Hunter). The longest was 159 chapters (Sket Dance). However, some anime adaptations were made after all the manga chapters had been released.

Source: Crunchyroll