In class or in competition, with qualified people around, you can sometimes push the choke, especially in comps.
There are people there to help you revive your opponent/partner.
There are reasons to PUSH the choke in training, the principle one to help your partner grasp HIS tolerance level to help him in competitions.
In the "real world" however, one must be far more cautious because one doesn't know the health or physcial state of ones opponent.
I have always advocated relasing the choke the moment one stops feeling resistance to the choke.
Of course the guy made be faking it, but no worries because eve if he is, he will be weakened enough to be easier to handle.
Psalms 144:1
Praise be my Lord my Rock,
He trains my hands for war, my fingers for battle !