It does work in a matter of days if used as directed.
It works instantly if you smash the little bastards with the can.
Oddly enough, though I live in Roach Central (Central Florida) and we always had a few roaches
for as long as I can remember, in the past few years I've seen almost literally NO roaches in my
house and I don't take extreme anti-roach measures. I think I've seen TWO roaches in the past four
years.
I think the reason for it is that there are a few geckos that have been seen in the house. Nobody in the
house worries about them in the slightest. They're walking bug vacuums and you rarely see them,
and they don't bother anybody. Plus they seem to be earning their keep, as evidenced by a near total
lack of observed roaches or other bugs in the house.
Natural pest control is the best...if you let it work the way it's supposed to.
CJ