Re: It's more binary than how many minutes are saved
"The lack of the Concord-NT has a lot to do with the scum of the earth aka Greenies. They basically castrated the Concord with "environmental laws" restricting it's full use."
Partly true, but think on this.
Concorde was a joint English/French government programme to carry 100 people at a time at M2.2 (and its prototypes had to be re-designed because the French insisted it did not need to be that big).
According to British Airways
it took them about 30 years to transport 2.5 million passengers.
A US report estimated the programme cost governments c$770m in 1965 dollars.
If you're balking at the cost of HS2 think what a modern 300 seat M2.2+ passenger plane will cost. You can bet no plane maker (or more probably consortium) would go into this without strong government backing.