Questions like this are clearly going to be slanted based on the perspective of the viewer. So here, it's not surprising that people have a laughably high opinion of a 225 max vs a 5 minute mile. I think there should be some sort of numerical metric (or at least a philosophical one) when comparing the two benchmarks, and not just general feeling as that is more easily swayed by personal experience. Metrics aren't as easy to establish for bench as they are for mile times (which are diligently recorded by HS results). In this case we need some sort of definition of a 5 minute mile based on something non-quantitative that we can port over to the bench. The definition I will use is that the 5 minute mile is a mark that a high school runner of "average" (again, this is up for interpretation) talent can achieve before they graduate. A high school student of "average" ability who spends 4 years lifting is basically a lineman/thrower. I will subjectively equate 300 bench to a 5 minute mile. I agree more with the posters who say 225 is closer to a 6 minute mile, maybe more like 5:45. This analysis is slanted since lifting ability seems to improve (relative to running) with age as it becomes easier to put on weight. When considering this question, maybe too we should consider that naturally big people have an easier time benching heavy weight, while naturally skinny people will have an easier time running faster over distance. I know people with relatively little experience in lifting reach 300 basically because they were whales to begin with, while I also know some people with no running experience who ran sub 5 on their first timed mile. Really depends on the starting point and natural inclination, but based on my "analysis" I think the 300-5min mark is apt.
The posters who are trying to equate a 4 plate bench to a sub 4 mile are flawed. Here is my take; the sub 4 mile was a world record in 1954 when there was a considerable ammount of attention in the sport. I think taking the shirtless bench record from this period would be a mistake as it was not nearly as popular, but at the time the record was 500. Adjusting for the popularity, I think that a 4 minute mile would be closer to a 550-600 bench. I have no idea how many people are able to do this in a given year, but around 100-200 runners go sub 4, so i would hope the marks i have set are equivalent in that way.
Anecdotally, my bench max is 225 (from 6 years ago) and my mile PR is 4:57 (from last year) and I am 25 years old. I think my body is naturally more suited towards lifting (I am 5 foot 11 and weigh 180 lbs). To get to 225, I was lifting 3-4 times per week (chest 1 day per week) while mainly focusing on soccer training. I spent two months or so focusing more on push ups to get from 205 to 225. Lifting was not my top priority. Even after I dislocated my shoulder and switched to squats/cleans/deadlifts as my main lifts, I was able to get pretty close to 225 with very little bench in my routine. To get a sub 5 mile, I switched my main sport from soccer to running and ran 35-40 mpw with 2 track workouts per week. Admittedly, my training was not optimal, but it took 6 months to go from 5:16 to 4:59. Even though I was putting considerable effort into my speed/agility with soccer and doing fitness work with shuttles, for me sub 5 was much more difficult than 225.