It meets at least once a year and has four years duration.

The long-term courses are of two to three years duration.

The course is of three to five years duration.

This plunged the Earth into a 'nuclear winter' of five years duration.

The program is of five and half years duration.

After the one year duration of study he was enrolled as village physician.

The degree is of five and half years duration, including 1 year internship after passing 12th Science.

All the above courses are of 3 years duration.

Hiring one young and good-looking daddy for half year duration.

During drought conditions the river has recorded zero flow for 2 years duration.