D Class Challenge Stats

I'm attempting to answer the question of "how long would it take me to get from 1350 iRating to 3000 iRating?" I'm running only D class events, mostly focusing on my pet series; Production Car Challenge. I've sprinkled in a few races from other series, most recently running the Solstice around Bathurst in the Grand Touring Cup.

Series Races Wins Avg PTS Avg Start Pos Avg Fin Pos Avg iR Avg SR
Prod Car Challenge 26 15 69 1.2 1.6 41 0.04
Mazda Cup 12 4 52 3.6 3.8 7 0.09
Grand Touring Cup 6 3 46 3.8 3.2 9 0.16
13th Week Mazda Cup 7 3 26 2.1 6.6 -17 -0.03
Spec Racer Ford Challenge 1 0 77 5.0 3.0 40 0.10

License C
Safety Rating 3.44
Corners Per Incident 30.73
iRating 2744
Total Driving Time 16 hrs 44 mins
Race Starts 42
Race Finishes 39
Race Laps 583
Race Incidents 219
Disqualified 1
Disconnections 2
Wins 19
Podium Finishes 34
Top 5 Finishes 35
Average Finish Postion 3.3
Qualifying Sessions 10
Qualifying Laps 88
Qualifying Incidents 29
Time Trials Run 0