A 75 mm diameter, 15 mm wide A80-M12V grinding wheel is used for traverse surface grinding of a 75 mm by 75 mm 1040 steel workpiece. The workpiece traverse speed is 1 mm/sec, the radial depth of grind is 1.5 mm, the (axial) intermittent cross-feed is 10 mm/stroke, and the wheel surface speed is 314 mm/sec. Estimate the required amount of grinding time (without spark-out) and the spindle power.