Season 2 - 1 time

207: HALF LIFE
Nikita: "Michael, disengage, let the Section sort this out."

Season 4 - 3 times

415: ABORT, FAIL, RETRY, TERMINATE
Madeline: "Everything the AI has done believed was in your best interest. We now have to convince it, it is in your best interest to disengage."
Birkoff: "Disengage! Shut down!"
Birkoff: "We're out of time. Disengage."

422: FOUR LIGHT YEARS FARTHER
Jason: "Michael at first mark. Teams 1 and 2 disengage. Michael, 75 meters, you have 20 seconds to hit your next mark."