This doesn't answer the question in a situation such as John E. described above - the legs were all less than 5 min, so the other pilot he mentioned kept pulling into the takeoff limit all day.
Surely the limit needs to be defined more accurately; manufacturers can nominate maximum temperatures, speeds and so on, so it must also be possible to say how much time out of the total should be allowed, or rather how long between 5 minute applications is acceptable.
Regarding landing, it is nonsense to say that this magical extra power allowance should only be used on takeoff - simple scenario, you take off heavy from a large, low DA pad and fly up a mountain to a tight pad where higher power is needed to get in. You would still only need to use the 5 minute rating once in the flight; what's the difference between using it in the landing phase rather than on takeoff?
It's our winter, Nick, but I'll still ask the question; why is such a limit made so non-specific as to be next to useless?
If they assume a few takeoffs per hour, then why not say how many are used in the assumption so everyone knows; if people can pull to 100 percent for 5 minutes, drop the lever for a second and then get stuck into it again, they may as well not waste the ink putting it in the flight manual.