Probably those of short duration; and that may be the secret.

The key, they explain, is to make many stops of short duration.

To tell the truth, their boredom will be of short duration.

The strike is usually of a short duration (a few days or a week at most).

The low water stage in this river is only for a short duration.

Medication can be used for a very short duration (up to four weeks).

This followed a period of relatively short duration (one year), but very significant for results.

In any case, the peace turned out to be of short duration.

However, they have been rare, of short duration and none since 1998.

There were a number of changes to the cast during the show's short duration.