The construction time for bomb shelters can vary significantly based on factors such as size, design, and materials used. Typically, a small, simple shelter can be built in a few weeks, while larger, more complex structures may take several months. Additionally, site preparation and obtaining necessary permits can also affect the timeline. Overall, a straightforward bomb shelter might take about 4 to 12 weeks to complete.
A long time
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It takes very little time to build an atomic bomb, once a country has the necessary industrial infrastructure to produce the fissile material.
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To defuse or plant a bomb in Call of Duty Ghosts, it will take 5.5 seconds.
The US were working on the bomb since 1941 up to 1945 when the first bomb tested.
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