The engine stop only goes on if your steering wheel is reasonably straight (won't go on if you're turned slightly at the bottom of a parking ramp or in a parking lot) and if you press the brake pedal past the "detent" that tells the car you want full braking power.
As for time limits, no set limit specified in the manual that I saw. (I only had the car a week, and I pored over the manual only twice, looking for more info on the system).
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