Finery Forge

ok, lol about the finery forge,
loaded it up, lit the fires, added the pig iron, and pumped the bellows as they were needed. but, didn't add more fuel. ---- approx. how much additional fuel is needed on top of the initial 40 and what might be the time involved for a complete job? (waiting on coal
or would answer my own question)
thx
loaded it up, lit the fires, added the pig iron, and pumped the bellows as they were needed. but, didn't add more fuel. ---- approx. how much additional fuel is needed on top of the initial 40 and what might be the time involved for a complete job? (waiting on coal

thx