15 hours to 2-3 days
500 Years
About 8 Hours by an 1890's aircraft.
you don't take anything away you have to add carbon to make steel
It depends on the composition of the steel as there are many different grades and types of steel.
5 hours
Steel Drums take about a week of hard labour to make Steel Drums take about a week of hard labour to make
The Bessemer process generally took only a few minutes to an hour to make as much steel as the older process could make in a week
Steel bridges take a long time to build because of the precision of the work. The pieces have to fit perfectly together, or else the bridge will not be safe.
how long does it take to make a crayons
not long, not short just in time for your pizza to be cooked :)
100
It took a long 3 years because, as they moved on they would miscalculated and messed up the railing.