I have found if there are no signal detections from my valentine during the "on time before power off" the car shuts down the ashtray port after x mins(never timed it). If I pull into a shopping center and leave the car with the detector picking up radar, it stays on regardless of the shutdown time.
That is how it has been working on my 2017.
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17 M3 ZCP -- 2017 Range Rover Sport SC
--RIP--
12 X5 50i Sport -- 11 M3 DCT -- 2011 X5 50i(Lemon) -- 2008 550 Msport -- 2007 x5 4.8 sport -- 2004 545 sport -- 2002 x5 4.4 sport -- 2001 540i Msport 2000 SL500 -- 1997 SL500
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