Is it possible to reduce the number of days to "0"?

Currently, we are using the Popup Pro plugin on our homepage. When a person clicks on the "x" the popup doesn't appear ever again. I know that I can make adjustments to the expiry time from 365 to 1. Is there a way to reduce the number to 0?

I am wanting the popup to re-appear when someone visits the site even though they click the "x".