I had recently the 60.000km / 4 year service. I asked price offer for the official Porsche Service at four different PC. Price differences are significant, between 730 and 1.060 euros. In one PC they need the car for a whole day, another for at least five hours. A thirth one said it would take less than two hours …
I had it done and i feel like they just put some random stuff on it to charge more. One of the invoice lines was (it also had a typo in it): Initializing communicative systems 90 euro ex vat
I was charged for a 4 year / 60k kms inspection, and also charged for additional work every 60k kms.