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It's currently estimated as '1 Apple', which is a bespoke time unit, roughly equivalent to any amount of time between 1 minute and 45 days.

EDIT

In case anyone is wondering, '2 Apples' is strangely equivalent to an infinite amount of time. It is for this reason that '3 Apples' has never been measured; it may be possible to record it with the new Mac Pro.

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Geeky tangent:

Its exchange rate of eight Ningis to one Pu is simple enough, but since a Ningi is a triangular rubber coin six thousand eight hundred miles along each side, no one has ever collected enough to own one Pu. Ningis are not negotiable currency, because the Galactibanks refuse to deal in fiddling small change. - H2G2