I know I could scrap a whole lot faster if I wasn't distracted by forums, Youtube, etc But my fastest was 1 1/2 hours. On average I'd say about three hours
I don't really know how long it takes me to do a LO. I work in fits and starts - I rarely have time to sit down and just scrap, KWIM? If I had to guess, I'd say between 2 - 6 hours. I've tried speed scrapping (like at crops),but I am never happy with the results. The LO's that take longer - where I've had time to look them over carefully - I tend to like better.
I just recently purged a bunch of LO's from my "Unfinished" folder because it had been MONTHS since I last looked at the LO
My forever seems a lot longer than other's forever. In fact I dont really count but I fluff around for way longer than I need to and I have quite a few in my in progress folder at any one time. The journalling comes pretty easy once Ive worked out what I want to say!!