There are still many out there who keep on waffling about that a crop circle cant be created in a specific amount of time. There are some very simple factors which many do not take into consideration.
In brief :
1. The size and complexity of a crop circle will ALWAYS be dependent on the amount of people who are willing to assist the artist or designer .
2. Early part of the season generally crop circles are smaller in design and less complex. This is simply due to the fact that there is less night time hours to create large and complex designs. They can still be created but they will be created over 2-3 nights.
3. By August crop circles begin to become larger and more complex. WHY ?. This is simply due to longer night time hours, giving the artist MORE TIME to create their designs. Its as plain as that !