it was supposed to be a 4 hour log, per the marketing on the paper packaging. It was probably around 3.5, but I added some small pieces of firewood at the end so I can't give a more exact burn time than that. I would do it again if I was going in for a short trip where I wasn't loaded down. Or canoe/hunting trips where weight isn't as big of an issue. Most of the time I wouldn't need 4 hours of burn time anyway, so you could saw one of those in half and still get a nice burn in the evening to dry gear, eat dinner, and go to bed warm. The biggest issue is that it burns a little dirty, no way could you use a screen type spark arrestor. But you get no sparks with one, it'd just be an issue if you were required to use one in a wilderness area or something like that.