A number of important changes took place over the 18 months.

Some changes are already in place, and others will take effect over the next two or three months, they added.

For him it took just a little over three months.

The complete review will take place over the next 16 months, he said.

It took him over nine months to cut the film.

Further discussions will take place over the next three months.

The job reductions will take place over the next 12 months.

That review is in progress and will take place over the next few months.

I have taken French lessons over the last few months.

The restoration took place over four months at a cost of $100,000.