Trawling through the data... first level confirms that pit stop times for the first three cars home were:
no 9 - Bernhard / Dumas / Rockenfeller: 33 stops (including 9 driver changes) total time in pit 35 mins 25 secs
no 8 - Fässler / Lotterer / Tréluyer: 33 stops (including 8 driver changes) total time in pit 35 mins 31 secs
no 7 - McNish / Kristensen / Capello: 33 stops (including 8 driver changes) total time in pit 38 mins 17 secs
Bear in mind these times include the time spent driving (at 60 km/h) the length of the pit lane, which takes approximately 24 seconds. So subtract 13 mins 12 secs from these times if you want to know the time spent stationery in front of the garage.
Also, the no 7 car was held at the end of the pit lane for approximately 2 minutes on its fifth stop (Capello at 20:57), due to the safety car being on the circuit.
Two years ago, the winning Audi spent less than 32 minutes in the pit lane, but then of course the regulations allowed tyre changes to be done much more quickly - by four mechanics instead of just two.
Further analysis later.