for those times that your shadow is say >3x as long as you are.
that is, when the season is many months away from summer, or the time of day is many hours away from noon.
type 1 ==> 5 min, type 2 ==>10 min, type 3 ==>15 min, type 4 ==> 20 min, type 5 ==> 25 min, type 6 ==> 30 min. 