If there's a world-wide all-out nuclear war it's said that there will be a "nuclear winter" all over the planet for several months.

He has been without employment for a month.

The exhibition will be open for another month.

The walkers set out from Boston and reached San Francisco six months later.

We bought our plane tickets two months in advance.

It will be three months before our house is completed.

This ticket is valid for three months.