How long do lava rocks for bbq's last?

Lava rocks used for barbecuing can last anywhere from 2 to 5 years, depending on usage and maintenance. They withstand high temperatures and can be reused multiple times, but they may eventually degrade due to heat, moisture, and exposure to grease. Regular cleaning and proper care can extend their lifespan. However, if they start to crumble or emit a foul odor, it's time to replace them.