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In the summer months, the X5 doesn't get driven as much as we drive our 650. With that said, it was about two-three weeks since my wife drove it into the office and back home (about 40 miles round trip).
I have the BMW trickle charger and had it on for about 1.5 days before it started to flash the Green LED & the Red LED, it then took about another 1/2 day for it to go Full Green LED and stay there.
This I have found is about average for the X5 as my 2011 was the same as my 2013 is.
As well, in the winter time when the 650 is in storage, I might take it out if we have a nice clean day (no road salt etc...) for a quick drive (maybe once a month at most) and it has always remained in a state where it will always start and no issues.
The only difference in my case anyway is that when the 650 is in storage it is locked, and the X5 is unlocked (I don't know if this makes any difference or not). I sometimes think that they use less power (draw) when they are locked.
Given all that I've also recently heard that BMW has started recommending replacing the battery at certain service intervals as they are just 'hard' on the battery.
The only battery issues I've ever had were with my 2011 335i Convertible. After about two years the battery would not hold a charge and BMW replaced it under warranty.
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