I'm very puzzled by this guy on strava. He had run some very long LR, at around 7 pace. Actually he run most of his runs at around 7 pace, and mostly below. Especially recently he's been running around 60 mpw almost all at Sub 7pace. But the guy's Marathon PR is slower than 3.
Granted his Marathon PR is dated, but back during the days leading to his Marathon PR, he was doing similar things.
For the life of me I can't believe how this can happen. My marathon pace feels pretty hard for me, and I can't imagine myself running my MP day after day at 60mpw.