I am just north of Syracuse and this is where my X3 will live for the next few years even though my home is in Florida. Yesterday was a warm humid rainy day and the rear window fogged up immediately after a blade swipe if the rear defogger was not on. I also noticed this past winter (in my Lexus SUV that is shortly heading back to Florida) slush and ice built up quickly on the rear window on cold crappy days while traveling at interstate speeds. If the rear defogger was adding heat visibility remained much better between blade swipes.
Anyway, my question was not to debate the merits of using the rear defogger but only to find out if the time delay to off is a programmable parameter. I either want the dealer to reprogram it if it is or, if the dealer won't, code it myself.