Wilson Kipsang produced one of the great athletic performances as he smashed the marathon world record by 15 seconds at the Berlin Marathon over the weekend.
To put that in some perspective, it used to be considered impossible for a man to break the four-minute barrier for one mile.
The 31-year-old Kenyan's remarkable effort inspired US website Deadspin to consider how long certain individuals in society could stay with the new record holder.
We took their calculations as a starting point and cooked up our own list of likely times help but you can measure yourself against Kipsang, who finished the 26.2-mile course in the German capital in an astonishing time of two hours, three minutes and 23 seconds.
How long could you run with Kipsang?
Couch potato: 20m (3.54 seconds)
Fairly athletic 12-year-old: 100m (17.69 seconds)
Five-a-day-eating, non-smoking, healthy adult: 200m (35.38 seconds)
Nauseatingly fit bloke you see jogging around the local park: 600m (1 minute 46 seconds)
The fastest person you went to school with: 800m (2:21)
A competitive county-level athlete: one mile (4:43)
Emil Zatopek, 10,000m world record holder from 1949 to 1956: 10,000m (29:18)
A professional half-marathon athlete: 13.1 miles (around 1:01.41)
Nobody, in the history of athletics: 26.2 miles - a full marathon (2:03.23)
How long do you think you could run alongside the new marathon world record holder? Post your comments and predictions below...