It generally ran a little under three hours, but usually varied in length.

Food chain vary in length from three to six or more levels.

Courses vary in length from a few weeks to two years.

The program has varied in length over the course of its run, between two and four hours long at various times.

For all Committee members, the terms of service were initially set at three years, but have varied in length since then.

International volunteer programs usually vary in length from 2 to 12 months.

Another problem was both class and ordering numbers could vary in length under the old system.

Individual programs vary in length, but run between one and three hours, once a week.

They were learned works and varied in length from four to over 400 pages.

The boats vary in length from 40 to 50 feet.