Engine cool down

[Hisham Amaral]

David and William
when I was flying a turbo charged airplane after landing I checked the ITT temp and idled the engine until ITT drops to 700 F, but unfortunately we do not have the ITT gauge on our coaches but we have to depend on a clock and thus I use the 5 minute idle for cool down.
If I have a long ramp to where I stopping and I am slow and at reduced power "under 1000rpm" I also reduce the 5 minute idle time before I shut the engine off.