I don't think I'll drive that many miles in my lifetime. I've had my car since college and it has about 145,000 miles on it. It took me over 11 years to get there.
12 friends and I flew from Hawaii to California then drove from California to Illinois in a van to go to a music festival. Then tuurned back around for California then flew back to Hawaii. One month on the road. I wanted to murder every single one of them in the face so hard by the time I got back.
1,000,000 isn't that bad of a goal. Just a few road trips from California to Alaska and back will do that. Amazing scenery on that trip too. I'd do it again at a moments notice, if fuel prices weren't so high, and my vehicle wasn't so innefficent.