I know that the V8 championship is 40 min long but what is the real length time for the Mini Challenge and the F3 races.
Mini Challenge = 25 minutes (triple heats);
Formula 3 = 30 minutes (double heats);
On a related subject, there´s a setting in the PLR for multiple race sessions in a weekend:
QUICK Num Race Sessions="2" // range: 1-4
MULTI Num Race Sessions="1"
If you set it to two, the second race has reversed grids.
This functionality however has not been very well tested so there might be bugs.