I passed with 83% which was better than what I had expected!!!
I used proffessional xml, whiz labs simulator and tutorials at
www.xfront.com and other mock exams.
The actual exam was bit easier than I had expected.
whiz labs was useful but has lot of errors. (atleast 3-5 wrong questions (that I know of) in each exam!! ). Also their online system has lots of problems. I think the will be better off if they give a offline version.
I cant exactly tell how much time it took as I prepared on and off for a long time...my last stint was abt 1 1/2 weeks.