The rod is rotated periodically during the collection period to gather samples through an entire 24 hour day.

Vouchers have an expiry date usually around two months after the end of the collection period.

Write down the time that you urinated to mark the beginning of your 5-hour collection period.

Keep the large container in the refrigerator during the collection period.

The collection period for the mushroom is from mid-summer to late autumn.

Keep it in the refrigerator or a cool place during the collection period.

This revised classification came into effect in the 2000 collection period, which was due on 31 August 2001.

It is named so because the most common collection period is one week.

The collection period is only about a month per year.

If not, past experience will still reveal important insights into the plausibility of different assumptions about collection periods.