Here's a thread on that subject: http://www.xoutpost.com/bmw-sav-foru...bone-bush.html

He details what it took to replace them on page 5 of the thread. I would think that how long it takes depends a lot on what you have for equipment and experience.

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2001 X5 Sport 3.0/5-speed
1998 318ti/5-speed
1988 735i/5-speed
1984 528e/5-speed (soon to be M20B25-powered 525i!)