Are both "an hour and a half" and "one and a half hours" correct? If so, is either more appropriate in different contexts?

Example context:

"The Superbowl starts in less than one and a half hours."

"The Superbowl starts in less than an hour and a half."


Both of these are equally good with hours and other common measurements. But maybe not with less common measurements. For example:

He drank one and a half glasses of water.

is more common than

He drank a glass and a half of water.

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    Your second example seems flawed; shouldn't it be "He drank a glass and a half of water"? – Elliott Frisch Feb 3 '14 at 18:24

The are both correct, and interchangeable; assuming you mean 90 minutes. One and an indicate the same singular quantity.

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  • Should we use Ninety minutes,two years etc. as plural or singular? – starun008 Sep 16 '15 at 12:21
  • In what context? You used a plural here. – Elliott Frisch Sep 16 '15 at 12:54
  • Ok you mean we can use both singular and plural for them. for example Two years is/are a long time. 2. two hours have/has been passed since he had fallen asleep – starun008 Sep 16 '15 at 13:00
  • @starun008 Two years are a long time doesn't work for me on its' own. But if we spent two years on something, it might. Two hours may have passed, but I hope I'm never a has-been. – Elliott Frisch Sep 17 '15 at 4:05

It seems that one is more likely to be used by certain people and not others. In the UK, sentences like

"The Superbowl (or anything else) starts in less than an hour and a half."

are more common and natural.

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    Do you have any examples of where ‘one and a half hours’ would be more common? I cannot think of any dialect or context where ‘an hour and a half’ doesn’t sound more natural. – Janus Bahs Jacquet Feb 3 '14 at 12:34
  • Janus, I meant that the "in less than an hour and a half" wording would be more common. – Tristan r Feb 3 '14 at 13:51

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