Slothfulness and the Porsche 911

Ok right up front I admit to my slothfulness, but I wanted to get the oil changed in the 911 yesterday and didn't feel like doing it myself so I went down to the local "****lube in 30 minutes" place and they sent out for a filter and said it might take a bit over 30 mins but hey, no big deal to me. I went into the waiting area and had 2 cups of their free coffee (worth every dime I paid for it) then walked around for a bit behind the shop and smoked a cig and came back around to the shop and there my 911 sits with the engine boot open and no one around so I find the manager and he tells me the "boy" had to run back to the parts store 'cause they had the wrong filter. So ok I says and "don't forget it takes almost 13 quarts of oil to fill it." So a bit later (like an hour) the manager hunts me down and says to me "it's already to go and only took 5 quarts." "Nope," I tell him it takes amost 13 quarts so that means you didn't drain the engine but half way and you need to drain both sides (it ain't no chevy V-8) so he says to me "you're wrong, I went under it and there is only 1 drain plug and I got all the old oil out" "Nope," I sez "you didn't" so getting kinda redfaced and huffy he says to me "well, you just have to come down under here with me and prove it" so there I go climbing down the latter into the pit, taking off my cowboy hat and donning a plastic hard hat (yellow) I come up under the car and say "see this drain plug? take it out, let the oil drain and put it back and then put in the fresh oil." Bottom line, the 30 minute oil change took just over 2 hours and I had to do most if it myself and it cost me $84. (they didn't charge me to fill the windshield washer bottle)