I am using PopUp Pro v 4.7.0.9 on a client's site. Love

I am using PopUp Pro v 4.7.0.9 on a client's site. Love this plugin!! I have enabled the PopUp Shown Less than option and set Display PopUp This Often: 1. Is the duration of the limit of one view of the popup for each visit to the site? Or is until the browser is restarted, cache cleared, etc.?