Several years. The Great Pyramid of Giza was thought to have been constructed over a period of 14-20 years.
3 years
About 20 years
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
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
How long did it take to build st James cathedral london
a long time
how long did it take to build seaworld in sandiego