The jump countdown is written in Ancient, and is displayed down to the millisecond. It is measured in hours. When the time remaining drops below one minute, the timer emits a beeping sound followed by the numbers turning red. There are timers placed in every key area of the ship; the control interface room, the gate room and presumably many more, including external timers on the shuttles. If Destiny's FTL engine is disabled or disrupted by certain means, the countdown will not activate until the problem is corrected. (SGU: "Air, Part 2", "Divided", "Faith", "Sabotage", "Incursion, Part 2")