@(you need an account to see links) I'm a complete noob at this, but there are some auto-clickers programs in which you can record your mouse movements and clicks. You can record yourself refreshing and clicking the banner, waiting 20 minutes and do the same.
However I'm sure it can be done easily with a script (like the BD auto-fighter one, with the difference that what you're asking is way simpler). Try to make a request (you need an account to see links), I'm sure someone will help you