25 years
Take tours and see the who building
a long time
it take 2 days
It took 273 days for them to build the pyramid
It takes a long time...
20 years
There are a number of 'Carnegie Hall's' and modifications. The links below will give you extensive information.
Take tours and see the who building
Independence Hall, Philadelphia
how long does it take to build a asimo
how long did it take to build the half moon
how long did it take to build the scottish parliment?
how long did it take to build cabot tower
Independence Hall, Philadelphia/Pennsylvania
hs2 will take 15 years to build
how long does it take to build a beam bridge of 2400 sq ft
it took 3 years