I have an 8gig Kingston filled and it takes about 30 secs with the latest program updates. Used to be much faster.
Also even though it continues playing where it left off, sometimes the display indicates a non related song is playing.

Service says that is the way it is!!!

Will be going to a 2011 ML350 Blue Tec soon so I don't care to
continue fighting BMW to fix their programs.

Good luck.

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Current - 2010 X5 35d
Retired - 2008 X5 3.0
Retired - 2007 X5 3.0
Retired - 2006 325 3.0