A slot of 25 mm \(\times\) 25 mm is to be milled in a workpiece of 300 mm length using a side and face milling cutter of diameter 100 mm, width 25 mm, and having 20 teeth. For a depth of cut of 5 mm, feed per tooth 0.1 mm, cutting speed 35 m/min, and approach distance and over-travel distance of 5 mm each, determine the time required for milling the slot.