Barit, are you talking about installed thrust or uninstalled thrust?
I think you are talking about engine on a stand.
Fair question, and you are correct about my example being on a test stand. But as long as temp values (and rpm, oil pressure etc.) are within redline, then my point is there's nothing magic about the time limit on the metallurgy. In fact, typically the engine may run a few degrees cooler after a minute or two at TO, as clearances stabilize.
The exception may be when climbing through a temperature inversion (i.e. temp profile is less than the adiabatic lapse rate). If the engine control doesn't accommodate this, then turbine temp may rise from when on the runway.