The Meaning Of The Shingle Bracelets Proper Length For Roof Shingle Overhang?

Proper length for roof shingle overhang? - the meaning of the shingle bracelets

What should the proper length for a tile roof overhang (I mean the part of the first line of Shingler to) stick to the deck? As part of my section of roof overhang is probably too long (1 3 / 8 to 2 inches). After a few years ago, is the protruding part down and the stars tipped crack in places. I have school, but he said the 2 inches is acceptable, and my type of culvert causing the problem!