Estimate the machining time that will be required to finish a vertical flat surface of length 100 mm and depth 20 mm by an 8 teeth HSS (High speed steel) end mill cutter of 32 mm diameter and 60 mm length in a milling machine. Assume cutting velocity (V_c ) = 30 m/min and feed (s₀) = 0.12 mm/tooth. Take approach and run over both 2 mm.