My 01 S behaves that way as well. The dash will stay lit for a couple minutes, although I have not timed it but its not too long.
I lock the car in the garage as well to force things to shut down right away.
Power drain is probably minimal for those couple minutes so I would not worry about it.
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"It broke because it wants to be Upgraded  "
2012 Porsche Performance Driving School - SanDiego region
2001 Boxster S, Top Speed muffler, (Fred's) Mini Morimotto Projectors, Tarret UDP,
Short Shifter, Touch Screen Dual Din Radio, 03 4 Bow glass Top (DD & Auto-X since May 17,2012)
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