The wall of china was made by the slaves of china to protect there area from the enemies. So no fix time frame is there but it had been long work more than centuries.
Sachin kalambe
15 years.
It takes 3 years
some raw backs of building Flood-Control Dams are it is EXTREMELY expensive, and takes many months to years to build. It also disrupts a river system.
20 years
20 years
It depends on how great you want to be because it takes long years to gain thinking skills to be a science writer=•=
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i think it takes at least 4 to 5 years
100
it takes 7 years
At the least it takes 790 years to make a piano. So don't try it it could takes MORE than 790 years.
8-11 years
It takes you 4 years of collage.