three-score
Numbers 20:29
When the whole community saw that Aaron had passed away, the entire house of Israel mourned for him 30 days.
Deuteronomy 21:13
remove the clothes she was wearing when she was taken prisoner, live in your house, and mourn for her father and mother a full month. After that, you may have sexual relations with her and be her husband, and she will be your wife.
Deuteronomy 34:8
The Israelites wept for Moses in the plains of Moab 30 days. Then the days of weeping and mourning for Moses came to an end.