User blog comment:FairyRaven/Fairy Tail Chapter 372: Breach, Review and Commentary/@comment-2214433-20140221133514/@comment-1839664-20140221154511

To all that believes Mashima will be drawing 5+ chapters a week, here's something for you guys to understand the release schedule:
 * Supplementary Shonen Magazine (Bessatsu): Once a Month　on the 8th
 * Magazine Special: Once a month on the 20th
 * Weekly Young: Once a week on Monday.
 * Monthly Shonen: Once a month on the 6th