Can’t speak to that person’s routine, but really depends on what your goals are.
I have no time goals or plans for an oraganized race. I just like to be in shape enough to do 30+ mile efforts about once a month w/ a 20-25 mile long run once a week and keep that up without injury.
My training is pretty simple.
I do 10 miles 2-3x a week. Mostly on flat roads but ending up at a nearby trail that has ~1,000 feet of climbing over 1.7 miles. My speed on the uphill section varies pretty wildly but by feel each effort feels nearly identical, tiring but by the time I finish I’m nowhere near exhausted. Average time for this route is probably 2 hours and 5 minutes (I did it 110 times last year).
On my long run day I try for around 20 miles with 2,000 - 3,000 feet of climbing. Sometimes instead of that, I’ll do a tougher 12-15 mile route with a similar amount of elevation. Again my goal is low to medium intensity with enough left over for another run the next day. My average pace here might be 12-15 minute miles.
I always run the day after the long run, usually 7-12 miles either flat or my 10 mile route described above. Just going off feel and what I’m capable of.
About once a week I do some kind of short fast intervals just because I like it. Something like 3x2 mile at a pretty fast pace (for me), like 8:15 per mile. Or 4 x 5 minutes at a little faster pace. Super easy jogs between intervals.
That usually adds up to 40-50 miles a week. I’ll drop down to 30-35 if I want a break.
When I’m at my “peak” fitness, I have no problem stretching the 20 mile long run to 30 or so. But it does take a little more recovery than I like and the risk of injury does seem to go up a bit.
My goal is healthy long distance running for decades so low intensity relaxed running is key for me.