I don't think it would burn overnight. I'm confident it would make an hour or two. The size of the log would be a big factor. To be honest I haven't burned one to the end yet. I've just been burning for meals and the video and extinguishing it. The idea is still only a couple weeks old, and with work, cows and... well you know. Cooks fish good though so I hope nobody minds my posting on this site. It would just be too cool to bump into somebody using one at the lake sometime.
By the way, do you guys hang out here in the summer too, or do you go another site.