500 Years
They are attempting to make a "real steel 2" however it may take time if it does happen.
15 hours to 2-3 days
near future;2018
No they are not hard to take care of as long as you stay on top of the cleaning with them. They can become a real pain when they are left alone for periods of a time.
It doesn't take any time because it is not real. People can not become mermaids. Mermaids are not real and a spell that turns people into mermaids is not real. It is make believe.
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
240-320 not much
No, airbending is not real.
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