This is something i just noticed. And its actually really cool to me. you actually have to get / make more to keep your house nice. they seem to last several days maybe up to a week i didnt pay attent...
ok at the 48hr mark they turn from normal to wilted and start to stink, and at 72 hrs the Excellent one is now poor. 96 hrs no change so they wilt an stink in the same time frame