Everyone heals differently. It will take some just days while others longer. If this is their first and they’ve been trying hard to get pregnant then this will be a lot more devastating than for couples who can push babies left and right.
Putting numbers on human emotions is what every HR office in every company does. Most allow 3-day bereavement days off and they’ll make you use FMLA or some other form of leave if you need more. They have to put a number on every so they can “calculate “ it. Is it right, no but they do it anyway. It’s all about $$$. We are capitalists after all.