Joined Delta Frequent Flyer program in 1982 at age 35
1MM in 1995
2MM in 2005
99.9% of trips are non-stop orignating ATL to (name your domestic city).. A lot of ATL-PIT-ATL (526 miles each way, in case you wondered)

A connection DL flyer back then could take advantage of the loophole under the old program where you could purchase upgrade certs with miles and then earn Double miles for flying F on both legs of your connection, thereby earning more miles than you spent and riding F in the bargain!

Alas, I was a hub flyer and could not manufacture miles that way ... I will advance the argument that this constitues earning 2MM the "Real Hard BIS" way. (but will admit to clocking a few during the 1986 Triple Miles frenzy)