A 74 quality forge will burn for roughly 2 hours 40 minutes with 20kg of woodscraps. It will burn for between 30 and 40 minutes with only the initial lighting and no additional fuel.
Tested 6/13/2012 on Celebration Server: a QL 50.01 forge using 20kg of ~QL 1 woodscraps stayed lit for 117 minutes.
== Usage ==