bhb is correct. 'My understanding' to explain is as follows;
A standard boost turbo will not require cooling unless say you have been on a trackday or somethink. If boost pressure is high the turbo works harder and heats up obviously (ie like rally cars when they glow they are so hot). If the engine was switched off then the metal cools too quickly damaging seals etc and thus damage long term can be caused.
For a standard Audi turbo I doubt it will ever get that hot or hot enough to require idle before being switched off.
I use a standard Volvo T5 hard most days and have never seen it need cooling or need seals/turbos replaced.
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