Nice. I only have FGT, the Grand Tour and the second set of seasonals completely clear. I'm about halfway through the AMG Driving School and I've just finished the first three Enduros.
The enduros are great because you really learn how a car handles. Sitting there with a wheel in cockpit view you can zone out and just focus on the driving and how the car behaves. The Viper I was just in for example was really heavy on cold tyres, but went where you pointed it, then slowly lightened up and really started to fly after a couple of laps until, many laps later and with little warning, it had cooked it's rear tyres and couldn't even hold a bend without any throttle applied.
Still, 9 hours at Taukuba... Hmmm. Suzuka as you say will be OK if I get the car right, I normally love it too, but I re-did the Supercar Nostalgia beginner race there in a Miura yesterday and it's temporarily put me off it a bit!
Edit: I'm back in to work on the 4th so it'll be setting B-spec going when I get in and only getting to properly race on a weekend after tomorrow!