yeah they dissapear into tin air. when they are active you see pink confetti. when the confetti stops you know your 30min, have passed. do note that to activate the pokelure you need to klick on the pokestop, then the empty button in the middle to install the lure.but i mean when they are installed do they act just like the incense do and last for the 30 minutes and once the 30mins are up they disappear like the incense do sorry if im not clear in writing my questions