I can now confirm (if it isn't already common knowledge), that it is entirely possible to get three flying laps out of a set of racing softs at the Nordschleife, with online physics.
I know this, because I set a 6.20xxx with the Denso Sard Dunlop Lexus SC430 (~605bhp/1100kg/RS-RS) earlier on a third lap.
Obviously, that is the fastest possible time with that car, and I had to anticipate the loss of grip on certain taxing corners, but as proof of concept, it is possible to get three flying laps of Nordschliefe with racing softs.
After the third lap, my tires were around the 40% mark, with wear roughly even between the front and the back (though favoured towards the front), with slightly more wear to the left side of the car, than the right. 👍