24k sounds about right for the standard clutch to go bye-bye! There's quite a few ppl that have had to change theirs around that mark, mine lasted up to 38k....kinda proud of it!
Order the organic AP Racing clutch. Its suppose to be the same as the standard one in the Focus RS, but you'll see a biiiiiiiig difference in quality.
Don't worry, this is pretty much the only crap part of the car....