The theory is the following. This applies to all turbo cars.
Back in the days when turbo came to the mainstream (Provided by SAAB with the legendary SAAB Turbo) the oils and the quality of the turbo's wasn't always the best. The recommendation was to allow the turbo to lubricate at startup and at wait at least 1 minute before you turn off the engine to allow the turbine to slow down while the bearings are still provided with oil.
Naturally the components have been improved. Nowadays you can generally say that when you start the car, just drive of (How often do you start the car and floor the accelerator within 5 to 10 seconds ??). You should allow the turbine to slow down (up to 30 seconds) before you turn off the car if you have driven hard or fast just before you want to turn the car off. To sum up, if you drive normally you don't have to think about it.
In my cee'd manual it says that you should wait up to 30 seconds before turning of if driven hard or fast.
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