A guy ceases to run in cock mode within 3 minutes of ejaculating- usually when cognitive thought returns and the hideous beast they have just lain with comes into full focus.
Cock mode can be a good thing if you're in a long term relationship with a girl who does your head in. Switch off your brain and let your penis listen to the inane chatter instead, and then secure a nice orgasm for you. Sorted.
"I was in cock mode, I didn't really know what I was doing"
"Ah, totally understandable. I switch to cock mode when my wife starts talking. I'm virtually unreachable"