I know somehow in Subversion you can ensure x chars when a developer commits in the comments section. I'm using Tortoise but don't see where to specify this globally and ensure that x number of characters will be entered on any commits made by developers. I'm using Visual SVN Server as well to setup repositories.
from the tortoise svn menu (explorer plugin) choose properties -> Add -> tsvn:logminsize
see also: http://www.anujgakhar.com/2008/07/22/forcing-svn-comments-with-tortoisesvn/
and
http://tortoisesvn.net/docs/nightly/TortoiseSVN_en/ch05s15.html
EDIT Tormod is right - it is good to have that policy on the server, but I just "enforce" it on the clients. We basically have an svnprops file we propagate. If people don't adhere to it then we have some discussion...
To be effective across an entire development team, this is a setting that should be set on the server, rather than in the TortoiseSVN clients. If you still wish to set this setting on the client, the setting that Tim refers to is illustrated in this blog post:
http://www.anujgakhar.com/2008/07/22/forcing-svn-comments-with-tortoisesvn/