It took me 4 months with the SCJP 6 study guide and all the practice tests I could fit in listed on JavaRanch but I finally took the test and got a 91%! I've used this forum for help with the SCJA as well and thought it was time I joined in the discussions. Thanks JavaRanch!
My best resources for preparation were the official study guide and Devaka's simulator - Exam Lab listed on JavaRanch's SCJP Mock Tests page.
SCJA 1.5, SCJP 1.6, OMG Certified UML Professional, IBM OOA