proper cool down times for a holset turbo

Stop & Go, Load - Empty, Turbocharger temp - Cool, Idle Time...Less than 1 min.
Stop & Go, Load - Medium, Turbocharger temp - Warm, Idle Time - 1 min
Highway Spds., Load - Medium, Turbocharger temp - Warm, Idle Time - 2 min.
City Traffic, Load - Max GCWR, Turbocharger temp - Warm, Idle Time - 3 min
Highway Spds., Load - Max GCWR, Turbocharger temp - Warm, Idle Time - 4 min.
Uphill Grade, Load - Max GCWR, Turbocharger temp - Hot!!, Idle Time - 5 min.

 

cool. i always try to let mine cool to 350-400* pre turbo.... no matter what i'm doing with my truck..... some don't do it but i call it cheap insurance...