The logs light fully in less than five minutes and burn for three hours in any type of open hearth fireplace. Not a single tree is cut down to make a Duraflame log and because they burn 80% cleaner than wood, you are also helping reduce emissions in your neighborhood.Click to see full answer. Likewise, people ask, how long will a log burn?The main attraction of firelogs is that they’re easy. They light without fuss, burn steadily for two to three hours, and when they’re done you have only a small pile of ash to sweep up. Wood fires need constant attention, and even when the flame is out, hot coals may smolder for hours.Secondly, do fire logs have an expiration date? They’re made from sawdust and wax, which don’t have any type of expiration date. They should burn well, as long as they were not exposed to dampness, moisture or heat while in storage. We recommend you always store Duraflame firelogs in a dry area, away from dampness or heat. Besides, are Duraflame logs bad for your fireplace? Burning more than one log at a time could result in too large or too hot a fire in your fireplace. It is not recommended that duraflame firelogs be used as starter materials for a wood fire. A duraflame firelog provides more fuel content than necessary to start a wood fire.What wood is toxic burning?Are there any types of wood that are dangerous to burn? Yes, poison oak, ivy, sumac and the like are dangerous to burn as the smoke from these plants can contain urushiol, the irritant that causes reactions to contact with these plants.