My safety rating went through the roof thanks to the 24 hours. It only counts individual laps for each driver (so if doesn't matter if one of your teammates gets 300 incident points if you only got a dozen), but all of our team hit the max for the class we had, so some are at class A 4.99! I myself am only at Class C 4.99 (only done 32 races in total).
It's a shame there's no way to calculate iRating, though that would be nigh on impossible in a team event.
I'm looking forward to the Bathurst endurance race. We've done it in endurance racing in GTP and at least one of the cars came away unscathed, so it's very possible. The nature of the track means it's automatically going to be harder than Daytona of course, but I think they're looking at using the V8 cars, so no mixed class, which is where most of the major incidents happened at Daytona (in our split AFAIK there were 4 or 5 instances of cars nailing the wall by themselves in a major way, but across 24 hours that's pretty remarkable. Most of the incidents was the result of contact with other cars, as we were well aware!).
Don't know if we'll do the Sebring 12 hours. At the moment I'm going to say "yes", but I'll see how I feel when we start testing. They've also added a Watkins Glen 6 hour race and a Spa 24 hour race... now they are tempting...