A study can take a year or two to complete.

Such a process, he acknowledges, could take years to complete.

But the major works will take another four years to complete.

By their very nature, they also take many years to complete.

Out of Shadows took one year and six months to complete.

They take years to complete and some are still expanding even as new ones continue to open.

The talk was of gradual change that could take years to complete.

The whole project would take a few years to complete, she said.

His next three years, he vowed, will complete the job.

The job will take years to complete, and may cost $1 billion.