Millions of years
it can take from around 5 minutes to millions and millions of years
Wind erosion is an ongoing process.
The time it takes for a sea arch to erode can vary depending on factors like the type of rock, the strength of ocean waves, and the climate. In general, it can take thousands to millions of years for a sea arch to form and erode.
18 000 years to form because water had to erode it away
About 5000 years
It has been estimated that the three phases of the construction required more than thirty million hours of labour.
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.
As Stonehenge was constructed long before written records were kept there is no recorded evidence of any construction problems.
A very long time, it was used to design the Pyramids and Stonehenge
30 Million Hours!!
stonehenge