I do about 10 1/2 hour practice essay exams for classes that have a 50/50 split between multiple choice and essay. Only 3 are formally timed and I write them in the practice section of examsoft. For a 3 hour essay exam I still do about 10 but only 1 or 2 are formally timed. Also if there is an issue I come across that I am unsure about or catches me off guard I will look it up and then continue. It does no good to write incorrect law as it will stay in my reptile brain.
ZERO. Waste of time for me. And I don't read the casebooks (I do skim them) or even go to class regularly (I probably miss 1/3 of my classes). I just cram for the week before exams, creating streamlined outlines, and it seems to work for me. After 1L, when I crashed and burned on the classes that I spent the most time preparing for, and aced the class that I rarely showed up for, I figured out that it is more effective in my case to just focus on the big picture topics at the end of the semester rather than get bogged down by irrelevant BS throughout the semester.