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In general, because that some variety of hours, add to some portion of an hour, you"d usage the number, plus the fraction, to add "hours", plural. "Four and also a half hours.", "Three and three-quarters hours," etc.

You are watching: How long is an hour and a half

However, for the specific case that 1.5 hours, the normal expression is "an hour and also a half". This consumption is so typical that "One and also a fifty percent hours" in reality sounds strange.


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One and also a fifty percent hours

English is a little strange, if I"m talking about exactly one hour, then ns say hour and not hours. Because that every various other number, I use plural. This applies to every noun in the English language that has actually a plural tense:

I have one dollarI have actually zero dollarsI have 1.1 dollarsI have -1 dollars
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I love hearing how English-as-a-second-language persons build phrases like this! It"s for this reason fun. Ns can completely understand what they room trying come say, yet marvel at just how they build the idea in a method that makes sense come them, but would be unexplained for a native English speaker.

Here room some ways indigenous English speaker would explain time:

Very common:

"an hour and a half"

"one and a half hours"

"an hour and also thirty minutes"

common:

"ninety minutes"

somewhat much less common:

"one hour and thirty minutes"

uncommon:

"one hour, thirty minutes"

not used:

"one hour, and also one half hour"

"the amount of an hour and half of an hour"

"one hour, to add an additional fifty percent hour"

"two hours minus one half hour"

"seventy-five percent of 2 hours"

Basically, if the sounds favor a math equation, it"s probably not used!


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Adam
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You can constantly get the end of this conundrum by writing:

An hour and a half

or:

90 minutes


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Other answers discuss writing the quantity as words. As soon as writing points as numerals, however, i would indicate that the decimal fraction .5 together being a perfectly an excjajalger2018.orgent way of indicating "half". Because that partial-hour quantities various other than 30 minutes, I would avoid various other decimal fractions uneven times room being measure up in six-minute or 36-second intervals, yet .5 is so idiomatic together "one half" that i would consider "1.5 hours" come be an ext readable 보다 "1 hour and 30 minutes" or "1 1/2 hours", or even "1½ hours".


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My interpretation of the conflict would be "two and also a half hours" VS "two and one fifty percent hours". The latter was taught in grade school. Toss the fraction in together you wish.


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