How long did it take to build Stonehenge?

Answer 1

To build the whole of Stonehenge will obviously depend on how many people there was for the task. What we suggested was that, given a great concentration of effort, is the sarsen structures, the biggest bits of Stonehenge, could have been built within a period of three years. We suspect that probably it took longer.

There is the opinion that Stonehenge was constructed in sections over a period of time that span as many as 300 to 500 years.