Well, I have no idea when that may be.
On the plus side, I can now afford to take my time with the game. In order to get many of the achievements, I had to play short races on low difficulty settings to complete as much as I could in one sitting, and then hope the save file would still be there the next time I came back.
But now, I've gone back to the beginning. I'm doing a Formula C championship at full distance, with hard AI, no assists or HUD, zero flashbacks, and a forced cockpit camera. It works out to a 40% XP bonus, and it's surprising how easy it is to lose track of your lap count and position in the heat of battle. And there's way more pressure without flashbacks, so I really have to be careful judging my overtaking moves.