Went through KJV Book of Psalm's, jotted down which are 12 stanzas, and which are 22. By pull of Hebrew letter, that stanza for that psalm is days meditation. Next psalm, new deal.
The psalms have interesting numbers, 4, 5, 7, 8, 9, 10, 11,12, 13, 24, 40, 50, 32, 22 etc ... During a LRP for example, one might recite a five line psalm.