no not two weeks to long. no more than a week.i have sucess with them the first 3 days make sure you turn your fan off as to completely fumigate the room i say 3 days as you will have hatchers and you want to kill them too.them run your show as always leave them in for a couple of days after that.pull them out and stick them in a ziploc bag and reapply them at the light change as this will bring the ones out of the dirt that ran and hid.i also neem my dirt at this time also(just to fuck their reproductive system) and when they come out the vapes get them dead.NO MORE DEVIL BUGS YEA.hope this helps