I'm guessing that NSX 3:07 was more than likely on the
Grand Course (4.2 mile) configuration.
Might be tough finding a good comparison because I can't recall any clubs that conduct HPDE events at VIR using the
Grand Course configuration.
My wife ran a bunch of HPDEs with her Z and she ran in the 2:2XX range on the
Full Course (3.27 mile) configuration.
I would say she was a slightly above average HPDE driver with a lot of track miles under her belt on various east coast tracks.
https://virnow.com/track/configurations