Check out Matt Bodie’s Article Length Limits: Further Results at Prawfs. Here is a taste:
My initial study last year found that, under the new policy, law review articles at a sample of the reviews had indeed gotten shorter. Looking at 230 articles published in seven of the signatories (Columbia, Harvard, Penn, Stanford, Texas, Virginia, and Yale), I compared those published after the policy to those published in the two editorial cycles before it. For those articles published in the 2005-2006 editorial season, the average length was 67 pages; in contrast, those articles published during the 2003-2005 seasons averaged 88 pages.
Has the trend toward shorter articles continued?
Yes. In this year’s analysis, I kept the focus on the same seven journals, but I extended the included articles both forward and backward in time. Overall, I looked at a pool of 591 articles from 2000 up though the summer of 2007.