How long does it take to get rid of hypoglycemia?

Can be instantaneous: If the person is receiving IV fluids, hypoglycemia can be reversed nearly instantaneously. If you mean bouts of reactive hypoglycemia in someone not in a hospital or on iv's, it can take longer. In someone ambulatory, drinking orange juice is an efficient way because blood sugar rises quickly.

Daily chore..: Sorry to say, but reactive hypoglycemia, which is typically what we experience, is not curable. Proper management includes smaller more frequent meals with as much as 50 grams of fiber for a woman/70 grams of fiber for a man divided evenly amongst the meals, with the intent of smoothening out the release of insulin from the pancreas throughout the day and night.