There are various ways to fight fires around your own home. Fire gels are popular options, and they tend to last longer than fire foams. You can even reignite their benefits to keep fighting against the fires. How Long Do Fire Gels Last? It is possible to get up to 36 hours out of a fire gel. That is under the perfect conditions, though. Realistically, the gel will lose its moisture content within six to eight hours, especially if it’s a hot and windy day. Gels work through layers of slow-drying water-filled bubbles. It’s possible to get the water bubbles back by misting the gel with water. Even when you’ve left the house, you can find that gels still work.