Well, no. Real fighters do much more roadwork than I, who does less because I'm lazy, and only have so much time to devote to this. Most pros do between 3 - 9 miles each morning during camp, depending on the guy, and wake up at 4 a.m. to do it.
It's different for the amateur ranks, though. My coach lives by the dictum of running four times a week, doing one mile for each round in your upcoming fight. Being as most Olympic boxing matches consist of two or three rounds of two or three minutes apiece, that comes out to about 3 miles per run.
He advises to do this four times a week. Obviously, I don't, but again, I'm not competitive. That's not to say I shouldn't run more - I should, and I would if I took a fight.
But it would be hard for me to do six or eight miles multiple times a week without an upcoming fight of corresponding length.
Are you training for a fight?