Acts 13:19

And when he had destroyed seven nations in the land of Canaan, he gave them their land for an inheritance, for about four hundred and fifty years.

Seven nations ... These were: the Hittites, the Gergashites, the Amorites, the Canaanites, the Perizites, the Hivites and the Jebusites, "seven nations greater and mightier" than Israel (Deuteronomy 7:1).

Four hundred and fifty years ... It is not exactly clear what space of Israel's history is covered by this period mentioned by Paul. It is evidently not the same as that mentioned in 1 Kings 6 which gives 480 years as the time between the Exodus and the beginning of construction of Solomon's temple. Significantly, Josephus identifies a similar period of 443 years elapsing between the Exodus and the beginning of the temple, which is apparently the same calculation made by Paul, the slight variation of seven years being covered by "about the space of" in Paul's reference to it. There is no certainty at all about the exact manner of this calculation; but the whole question is of little importance. The variations in the report of this period derive, in all probability from several methods of choosing terminals at both ends of the period. H. Leo Boles gives a very logical harmony of the variations.[24] Also, there is the fact that Israel did not count some years when they were not ruled by judges. Even a Nazarite lost time if he did not comply with the law (Numbers 6:12).