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An 18-month-old girl weighing 10.0 kg has had four days of diarrhoea and has been given water and diluted cordial at home. She is lethargic with a doughy feel to the skin over her abdomen, but her peripheries are warm, her capillary refill is under two seconds and her blood pressure is 96/58 mmHg. Her weight three weeks ago was 11.1 kg. Serum sodium is 163 mmol/L (135-145) and glucose 5.1 mmol/L. Over which one of the following periods should her fluid deficit be replaced?
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