Extended Project... I currently have no time for it at all. I am making an animation for my artefact (I do English Lit and I couldn't stand the idea of another essay!) and it's really time-consuming. It isn't really challenging, it's just the amount of time and level of planning you have to put into it.
Rewarding... yes. Once it's over it's brilliant. You need to do about 3-4 hours work a week for it apparently, but bear in mind part of the marks go to time planning and organisation.