I spoke to my dealer few days back about getting the same thing done...swapping out the stock springs with Racetech.
Their answer was 1.5-2hrs, so I am assuming it is the same for you. Although I believe if you can get the service manual, you might be able to do it yourself. You might have to top up the fork oil though.
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2010 Acid Green | ABS DTC Shift Assist | Yoshimura full Ti exhaust | PCV | Sharkskinz belly | Cox guards | Ventureshield | LED turn signals | Gilles+LSL sliders | Powerlet | R&G Tail Tidy | BMW tall-tinted windshield | GB Racing guards
// 2008 X5 Black
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