It must be summer already, that's when this question is asked yet again! Can't wait for Lu to get better, the missing 18 degrees is next on the annual schedule.
The rating is a takeoff rating, use it for takeoff. You get to use it for up to 5 minutes each takeoff. If you are not taking off, you don't get to use it, and if you use it more that 5 minutes, you are technically (and actually) harming your machine.
The engine and transmission manufacturers assumed a few takeoffs per hour, and they calculated the overhaul on that. Use the power less, and you make TBO or beat it, use it more and you don't.
Hurry back Lu! Its almost time, and we are starting to miss you, its getting dull around here!