Does anyone know how long it takes for calories ingested ...

[carla]

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Oh dear Carla, have you had one too many mince pies already?

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how long is a piece of string ?!

It would depend on the metabolism of the individual and I guess how easily digestible to food was.

But the answer is bound to be sooner than you would want

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Why carla?

hours to days I would guess - certainly not a week - if you haven't used it by then you will have assimilated into your body (fat) or excreted it.