Last quite a few hours. I can't remember using a full one up in a hunt. Most last a few hunts.

And they absolutely do work. Light it up and the bugs are gone in minutes.

The only things they don't work very well on are those nasty gnats. We call them bull gnats, but I have heard them called buffalo gnats too. The kind that buzz around your head and crawl in your ears, eyes and nose. The more you swat them the meaner they get.