en_tn/jdg/15/20.md

in the days of the Philistines

This refers to the time period that the Philistines controlled the land of Israel. Alternate translation: "during the time the Philistines controlled Israel" (See: rc://en/ta/man/jit/figs-explicit)

for twenty years

"for 20 years" (See: rc://en/ta/man/jit/translate-numbers)