Good point about the battery disconnection taking time. That probably takes more time than actually installing the unit itself.
Just curious, what exactly caused you issues with one of the sensors? I've installed stage 1 and then 2 more recently and only the stage 2 extra sensor caused me issue since it took me a min or so to figure out how it unplugged.
5-10 mins seems reasonable (it probably takes 5 mins to disconnect/connect the battery).
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