no not eveytime or every day but rather:
everytime you have made a 'spirited' journey. (ie used the turbo and it may be very hot).
you can of course take the last few mins of the journey easy to aid cool down.
someone at some point may say something along the lines of:
"but doesnt the coolant pump carry on oafter you switch ignition off?"
This may be true, dependant on the model and year. But i wouldnt take this as effective cooling if you have been putting your foot down. Letting a very hot turbo sit may cook the oil which then may lead to issues.