I think this is a general question of how much time off before we quit paying them. If @cdmwebs takes one week off for the birth of the baby, do we not pay him for that one week? That seems a little silly. If he decides to take two months off it's a different story. Maybe suspension of pay is tied to the 15 of 20 business days. 

That could be the threshold for unpaid parental leave, unpaid disability leave, etc.