I have experience in Microsoft Flight Simulator with the Daher TBM 930. It has an inertial separator, which I use for de-icing in the simulator. I watched a video on it, and I understand how it works, but don't get why it takes 40 seconds to deploy. It's pretty simple, only a valve opening in the turbofan and another thing coming down to redirect particles into the valve.
So why does such a simple mechanism take such a long time to deploy? Maybe I am not fully understanding how it works?