3.5 years
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It takes about over 500 people to build a turbine wowza!
about 1.8 million pounds
It depends on the size, but usually three or four months.
The turbine companies generally claim 20 to 25 years. Recent studies have shown that the life span is probably more likely to be around 10 to 12 years. This is due to the electronics within the turbine itself. Most electronics are build to last for 10 years as after this time it is thought they will be obsolete (which in most cases is probably true). The wind turbines electronics are no different, while the blades and outside may well be build to last for a far longer time, the components are build to standard electronic component levels and are generally not build to last longer than the average 10 years (that's not to say that in some cases they wont though). So there is a fair possibility that after 10 or so years the complete inside of a wind turbine will need replaced, effectively meaning the whole wind turbine will need replaced.
The inventor of the wind turbine was Charles F. Brush in 1888.