New Year's Holiday Challenge races are fun. Their descriptions estimate 30 minutes for completion, but I managed to complete the Suzuka Circuit and Nordschleife races in ~22 minutes.
The events are considered expert-level, but Skid Recovery Force is forced on. There's penalties enabled. Haven't received any from collisions with other cars, seems to only be shortcut and barrier penalties. Fuel consumption and tire wear are enabled.
The events are:
600PP GT500 class. 10 laps on Suzuka Circuit.
600PP Tuned Cars. 3 laps on Nürburgring Nordschleife.
700PP Racing Cars. 10 laps on Spa Francorchamps.
Corvette C7 Test Prototype. Time trial on Nürburgring Nordschleife.
Lasts until January 9th, 2013.
I found this tune to work well for the 600PP Nordschleife tuned race. [You must be registered and logged in to see this link.][You must be registered and logged in to see this image.]