Judg 3:30

“Now, judges were established over them from the time they took over the promised land and before the monarchy began. And even during this era, the children of iniquity, that is, foreign foes, afflicted them, for we read they had now peace, now war. Even so, you can find periods of peace in the age of the judges longer than that of Solomon, who reigned forty years. Specifically, under the judge named Ehud, there were eighty years of peace.”

“Eighty. The Hebrews use the letter p to express this number; and, as it is very like their c, which stands for 20, Houbigant suspects that he first number is a mistake of the transcribers. Usher confesses that it is “extremely improbable” that Aod should have governed so long, after he had slain Eglon, as he must have been at that time, about 40 years old; and the Israelites were not often so constant for such a length of time. (Houbigant, Proleg.) — But this difficulty does not affect Usher, as he brings Aod forward only in the 80th year from the peace of Othoniel; and instead of allowing him 80 years of peaceful sway, he says Samgar appeared after him; but, it seems, both together did not reign a year, since in that 80th year, he commences the servitude, which Jabin brought upon Israel, from the year of the world 2679 till 2699, and peace was not restored by Barac for other 20 years! (Haydock)”