So what is the battle set item (one of 6) that ppl got from hot event?

Just heard from somone "To let you guys know the storm potion expire the 8/30 if you double click it and press no it will show the expiration time. "

is this true? What if you don't use it past august 30th, are there such things as inherent expire dates? As in an item expires, but it doesn't say it expires?

Nexon can remove them via Server Maintenance. And it so happens that August 30th is a Tuesday.