Time required to change suspsension

Vehicle Information: Year: 2001; Engine (type, size, modifications): 3.2 w/ headers, sport cats, GIAC chip, lightweight flywheel; Total Mileage: 12,000; Transmission: Manual;

How many hours (real time, not flat-rate) should it take a qualified Porsche mechanic to install the RoW 030 suspension (springs, struts, sway bars, bushings), not including alignment?I've been told that a qualified Porsche mechanic with a lift and air tools can easily do this in one hour per corner or four hours total. Correct?Thank you