Cross reference
Judges 3:30
30 So Moab was broken that day under the hand of Israel. And for eighty years the land had peace.
Judges 3:11
11 Then for forty years the land had peace, till the death of Othniel, the son of Kenaz.
Judges 5:31
31 So may destruction come on all your haters, O Lord; but let your lovers be like the sun going out in his strength. And for forty years the land had peace.