How does ProQuest record usage for a user who clicks on the same link twice within the same session due to a slow internet response?

There's a 30-second rule that would apply in this case per Counter guidelines. If a user clicks twice on the same link, refresh the browser or hit the "Back" button within the same session in less than 30 seconds then it would count only once. If it happened in more than 30 seconds then it would count twice.