6 F in a N F?

At first I though 6 Feet in a Nautical Fathom but in the same puzzle is 6 F in a F which is it. So any idea what else "6 F in a N F" can be ?

Answer:
i hate these things!!!!!! like them too, they get stuck in my head & i have to keep thinking about them til i know the answer!

i have pathetically so far come up with 6 feet in a normal funeral!!!

will keep thinking x

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