Its going to also depend on his definition of a fly.
Are you hitting top speed by the time you hit the first cone, so to speak, of the 60m? Or are you just using a small roll in before the start of the 60 so you are in actuality probably only hitting 15-20m of max V at the end of the run?
Also 480m of any sprinting is incredibly high volume. How many times a week can you handle that amount?