I think it only took me about 45 minutes to change them on mine, although I broke 4 of the old plugs and 2 new ones. I jacked the car up so the wheels droop and my rubber flaps are missing, so....
My old Chevelle was a pain, that car took me about an hour and a half to do, even though it's a small block Chevy V-8, the engine sat low in the frame so I had to work around the A-arms, the A/C compressor on the drivers side, the A/C box on the wall, and the steering shaft, and oil dipstick, the only 2 plugs were easy to get to and even then I had to remove the air cleaner to get to them because the snorkle and heat riser tube were in the way.