I use a Screen Reader and work for a university.  Our university is
instituting a ten hour a week modem use limit for those of us who dial
in from home.  I'm requesting tripple time because it takes longer to
tab around a website than to point and click.  Has anyone encountered
this problem and/or has anyone seen (or heard for that matter) any
studies about how much longer it takes to navigate using a screen reader
than using a mouse?
Thanks. 
Kathie