The study took place over a 2 month time period.

The project is expected to cost £30 million over a five year period.

The film was shot in 35 days over a 53 day period.

But people have known me over a long period of time.

The story takes place over a period of 24 hours.

The book takes place over a period of 43 years, from 1706 to 1749.

The play takes place over a period of six weeks.

I have known you well over a long period of time.

Even then much may return over a period of time.

He had six children with her over a 12-year period.