I couldn't get the difference between these?
give me a two hour leave
give me two hours leave
What is more, when it comes to using the latter, which one would you rather use?
two hours' leave
two hour leave
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Both are okay. However, I'd write in this way...
Grant me a two-hour leave (note the hyphen)
Grant me two hours' leave (note the apostrophe)
That's because I am making two-hour an adjective. On the other hand, if I want to use possession, I'd go for the second sentence.
Another option could be...
Grant me a leave for two hours (clarifying all possible ambiguities in your mind!)
Give me a two-hour leave. (I've used the hyphen to make a compound adjective)
Give me two hours' leave.
An example of use:
Back at the depot she requested forty-eight hours' leave. (Millions Like Us, 2011)