it is not something you have to worry about on our cars. now lets say that you have been running it extremely hard for a good period of time like on a track day where you do numerous laps one after another, then you can let it idle for a minute. even then by the time you get off the track and get to the paddocks, that is usually enough time for the turbo to cool off.
2013 BMW ActiveHybrid 3 /// Msport Pkg. M performance fornt lip, Black Kidney Grills, H&R Sport Springs, BBS CH-R