I modeled this car the last year. It took me MANY, MANY weeks to get it done. Not only the modeling, also texturing and light setup took a lot of time.
The final blend-file has 363,2 MB
Render time for one frame at 1280x720 was about 7 minutes.
The second car I did took me one week. 15 hours.
The final blend-file has a size of just 3.2 MB
Render time for one frame at 1280x720 was about 2 minutes.
So I dare to say that’s progress in every single part.