The keys are:
1. Use INTENSE SETTING when first getting in a hot X
2. Roll down your windows for a minute to exaust the hot air. I use the remote as I walk up to the vehicle and it automatically rolls down all the windows, buy the time I put the X in drive all the hot air is gone.
3. Be sure that you have all blue bars in idrive vent settings
4. I find if the rear air is on, the system takes longer to cool. If I dont have rear passangers, I use idrive to turn off rear air.

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2013 X5 35i M Sport