3 years in addition to eero
The arch of what?
The Gateway Arch in St. Louis is one of the most popular visitors attractions in the country. It took two years and a crew led by an award winning construction crew.
This may help alot http://www.hirstarts.com/temple/temple.html
building an arch bridge takes time.. depending on weather or climate. most bridges are completed between 10 to 15 years.
The tallest arch made by humans is the Gateway Arch in Saint Louis, at 190 meters. Landscape Arch in Arches NP is the tallest one there at 93 meters. Aloba Arch in Chad, Africa, is a natural arch of height 120 meters.
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
About 30 minutes
hs2 will take 15 years to build
how long does it take to build a beam bridge of 2400 sq ft