The short term symptoms, anything from 5 minutes to max 30 minutes if it's quite harsh, depending on how much sugar you eat to treat it, how quickly it was absorbed, how low you are, how much active insulin you are fighting. The stress response to a hypo can shut down the flow between the stomach and the bloodstream, and that can make it take longer to recover from the acute effects.
Longer term there is a process of restocking glycogen that can cause tiredness and possible further hypos, for me I feel knackered and this often lasts until I have had a good sleep. For this reason a good meal and an early night, and not too much insulin for corrections, is good after a hypo. Impaired hypo awareness can continue 24 hours or so.
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