Unfortunately the answer is "it depends". They give you a client/server type project and then it will be based upon your experience as to how fast you get it done. Somewhere in the forum someone claimes it took them 3 weeks of full time work to do the project from start to finish. My guess is that they were probably a pretty experienced programmer in terms of DB, network/RMI and GUI coding to get it done that fast.
You will also find posts of people realizing how long it would take to complete and then they went ahead and started one of the other certifications first because they wanted to build their resume fast and this wasn't the project to do it.
I received my assignment at the end of January and it's now the 3rd week of May and I expect to be done within a week. So 12 weeks of at least 12 hours a week spent on it puts me at 144+ hours. I had experience with ReaderWriter locks and I chose Socket networking (as opposed to RMI) because I had implemented that type of logic at least twice before. So I completed those parts of the project very quickly, but because I had never done more than a single panel on any GUI app I've ever written, I spent most of my time learning how to program a complex multi-pane GUI.
Hope that helps.
Richard [ May 25, 2008: Message edited by: Richard Roehl ]