I averaged 130mpw in my early 20s while working 40hrs per week as a journalist. At the time I was a sub-elite chasing an Olympic Trials qualifying standard. I had a 1-hour commute to and from work, so I had to be out of the house each morning at 8am, and I didn't return until 6pm.
I awoke each morning between 4:30am and 5:30am, depending on the length of that day's workout, and I trained again in the evenings. I took one day a week off. I was single at the time, but had a (thankfully supportive) girlfriend.
This kind of lifestyle is doable, but it's extremely monastic and requires dedication and focus, and the realization that you're not going to be doing much else besides training, working, eating, and sleeping. I tried to get to bed each night by 10pm, but the exigencies of life sometimes made that impossible. I always felt like I was in a rush, and even simple things like grocery shopping or getting a haircut required advance planning so they didn't cut into training time, or rest, which I never seemed to get enough of. Every minute counted. When I returned home from work in the evening I would start undoing my tie and the top few buttons on my shirt as I neared my house, just so I would be able to get out the door for my second run that much faster. I reached a point where getting up at 7am felt like "sleeping in."
I don't mean to emphasize the negatives, but it wasn't easy. However, running was extremely important to me at the time, I loved it, and prioritizing it was something I wanted to do, so I found ways to do it. I never reached that Oly qualifying standard, but I have no regrets about trying. You only live once.