Chinny:
I'm not 100% sure [like 98%]---that if you have brake temp. gauges then it you don't have to defer to the time limit guidance specified in the AFM---as the temperature is the limiting factor in BE absorption---not time---
However if you have no gauges fitted or it's a MEL'd Item---then you must adhere to the brake cooling times in order to assure that a RTO {especially if actually limited in the RTOW by BE}
Capt Claret--- If I were the skipper I'd wait until
All the Brake temps are below limits
PA