It took 5 strokes to complete a PAR 3 hole if you scored 2 over PAR, as 'over PAR' means additional strokes beyond the expected PAR value.
If you are at a hole with a PAR 3, and you scored 2 over PAR, then it means it took you 2 more strokes than PAR to complete the hole.
PAR signifies the expected number of strokes an expert golfer should take to complete a hole.
A PAR 3 means that an expert golfer would typically require 3 strokes to complete the hole.
Scoring 2 over PAR thus indicates that you took 3 (PAR) + 2 (over PAR) strokes, which is a total of 5 strokes to complete the hole.