The quality level of a forge affects both how long it stays lit for and how long it takes to heat up items.
:''Example'': A 40 QL forge will take a couple minutes to get iron lumps glowing, although it depends on the quality of the lumps also.
:It will last for about 40 minutes before it needs refueling. A 70 QL forge burns for 115 minutes.'''*Due to updates, this information is incorrect*'''
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.