We're always expediting our climb. The whole point is to get to altitude as fast possible to take advantage of favorable winds, higher true airspeed and most of all lower fuelburn. Even with a max derate t.o., climb thrust will be back at max in the teens somewhere.
To expedite, trading speed for altitude is necessary (a zoom climb) and that only works for 2-5000' depending on initial speed. Once the speed is bled off, climb is going to be a lot less then it was initially, even without accelerating.