This thus requires crew to be aware of the time after which (even if not yet having completed the escape manoeuvre) to select MCT. Many crew in the simulator are oblivious to this fact as they tend to practise EO which achieves Flap Up selection and MCT selection within 5 minutes. When faced with the time limitation (due required turns, very heavy weight, a higher MFRA than standard, etc), many crew forget the time limitation and it becomes a nice discussion point afterwards.
I'd like to know on what basis any OEI procedure has the aircraft not clean and VFTO by the time the 5/10 minutes is up?
The only one I can think of is a wrongly calculated take off weight.