@Karm not a month you still may have to wait until June since the release date for chapter 78 is between March 20th-june 21st and now author posted on twitter that every month the chapters of season 3 will be released as follows:
On the 10th/20th/30th day of each month a new chapter will be released
On the 10th/20th/30th day of each month a new chapter will be released