There isn't a finite number that's the same from captain to captain (or even animator to animator). Pay attention to the shapes at the beginning and end of the pattern, and then proportionally space the diamonds and dots so that they fit evenly around the bottom of your haori and begin and end on the correct shape. It just takes some thinking and pre-planning. It would look awkward if you thought you had the right spacing, started from one side, and then when you were almost done realized you have an extra 5 inch gap between shapes or something. Use a temporary marker like pins, washable chalk, etc, to plot out the spacing before you even start painting (or sewing if you're appliqueing).
Founder and Vice-President, Madison Area Costuming Society, a chapter of the International Costumer's Guild
Strange Land Costuming - www.strangelandcostumes.com