Checking out the source of openoffice.org through Seneca network, I realized that if svn's protocol is used for "checkout" it takes forever to download the source. But if http is used instead, in less than an hour the source is checked out.
Most likely, it is the ITT's routing rules that causes this...
svn co http://svn.services.openoffice.org/ooo/ whatever
svn co svn://svn.services.openoffice.org/ooo/whatever