I have installed a turbo timer the moment I got my car last time. Honestly, I have not used it more than 10 times to cool down my car in the span of over 7+ years. Most of the time, I use it to cool down the cabin with aircond before I enter the car on a hot afternoon.
Honestly, you don't need a turbo timer for stock turbo nor TD05. Unless you have stage 3 mods and after a track session, else I don't see any reason why you need a timer to cool the turbo. More of using it as a must-have tool for turbo cars. :)