He said that the study will take at least three years.

Officials said the new studies would take two to six months to complete.

She said the study could take three to six months.

A study can take a year or two to complete.

The study took place in the late 1960s and early 1970s.

The studies and work took place from 1819 until 1832.

The study took place over a 2 month time period.

These studies will take two to three years to complete.

This study took place from fall 2009 through summer 2010.

Officials said that study of the plan would take at least six weeks.