How long is a while.
Na races are still 20 mins ish per car class. you can still login to GT HOME and it will show you.
Because the classes of the cars are currently fixed changing tracks won't change the results.
They have chucked in a minour change buy increasing the frequency of the Car line up on grid rotation you might see some cars that were hidden before per class.
They will need to add new car classes or races that require pit stops and may be dual driver selection from the host.
That would shake it up a lot.
