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Hi I have a question:

"sleep for two hours" --- in this phrase, "for" expresses the duration.
while,
"nothing to do for the next two hours" --- in this phrase, "for" seems to express something else. (I don't know how to put it... maybe "target"?)
Am I correct?

Then, how about the "for" in this phrase:
"for the next few hours" --- "duration" or "target"?

Thanks in advance.
Comments  
Hi,

in both sentences for expresses duration of time.

Take a look.

I sleep for 2 hours every afternoon.

There's nothing to do for the next two hours. In this sentence for also expresses duration of time. However, the use of "the next" emphasizes that the next 2 hours, to be counted from the moment that the sentence was said, will be spent without anything to do.
Thanks rafaelinrio.

So, in the expression "nothing to do for the next two days", "do for the next two days" is a unit, not "nothing for the next two days" ?
This is where I got confused.

I took that "for" just like the one in expression "save this food for the next two days (of survival)" .
In this one, for is not "duration" .
Am I correct?