But it is precisely these Waits that you should address. i.e. where there are many requests each experiencing (on avg) a 11ms wait. Thus the cumulative figure is significant. I read somewhere that this Wait is not a user wait & that it is a measure of how long SQL has been waiting for client app to send data. In which case it would be a User wait and you need to address issues in the app.

Will update when I have more info.