It depends on the construction, how complicated it is. Some simple bridges may be built in less than a year, others may take 4-6 years.
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Steel bridges take a long time to build because of the precision of the work. The pieces have to fit perfectly together, or else the bridge will not be safe.
how long does it take to build a asimo
The original Sunshine Skyway Bridge was constructed in 1954, but destroyed in 1980. The new bridge took five years to build and construction took place from 1982-1987.
they really did build the bridge
I toke two years to build