Plural and possessive units of time

When units of time are used as possessive adjectives, an apostrophe s ('s) is added to singular forms. An apostrophe follows the s in plural forms.

Singular form:
a day's wait
an hour's delay
Plural form:
return in two weeks' time
several days' wait
a few hours' time

Time spans

Use a hyphen when a time span as a compound modifier precedes a noun.

He took a 12-month course in anatomy.
She completed the testing over a 3-day period.

Do not separate related time-span units by punctuation.

She ran the course in 4 hours 15 minutes.
His symptoms abated after 8 hours 30 minutes.
She was in labor for 10 hours 45 minutes when we made the decision to do a c-section.


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Page last modified on Sunday 14 of November, 2010 21:11:35 UTC by admin.
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