How to say "two and a half hours" in English?

In English, "two and a half hours" is expressed as "2.5 hours".

This can be done in a few different ways depending on the context:

1、If you want to express the whole number of hours (i.e. 2 hours and a half), you can simply say "two and a half hours". However, this might not be the most common way to express this in English.

2、If you want to express only the fractional part of the hours (i.e. 0.5 hours), you can say "half an hour". This is more commonly used when discussing small amounts of time.

3、If you want to express both the whole number and fractional parts of the hours, you can use the phrase "two hours and a half" or "2.5 hours". This is the most direct way to express this in English.

4、You can also use a timer or clock to tell someone that it's two and a half hours until something happens. For example, you could say "It's two and a half hours until the movie starts".

Remember, in English, we generally do not say "two and a half hours", but rather "2.5 hours" or "two hours and a half".

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