> If I told you to be prepared for a few weeks of rest, exactly how many weeks would you be prepared for?

Maybe this is what you are trying to say, >>1 ?

The answer is, within English it is assumed that "a few" is a non-definitive number that can represent any multiple amount, so I can't give you a numerical number to it, since it is interpreted. However in terms of "ambiguous counting" in order of smallest to largest; a couple, several, a few, many, a lot.

For the record I am a native speaker of English, and I speak Commonwealth English.