Heh 😃
I'm not 100% sure about hours, but what I have done with max are:
Some edits for GTA San Andeas cars.. like Prelude style rear lights for Previon (1-2 hours)

Tried to follow one tutorial, Mini Cooper. Didn't get ready.. (Don't remember)

Few weeks ago I started to make Honda Prelude Gen 3, but I noticed there was a lot errors.. (5-10 hours)

And now currently trying to model this Alfa, carefully. (Don't remember hours, somewhere near 20-35 hours)

I'm making dashboard now, I have no blueprints for it, so I need to do it with pictures.
Poly count about 10 000
Poly count with smoothing is 80 000