<prompt> In case of fasting, glycogen stores in the body can last up to:7 days72-96 hours6-8 hours12-18 hours  <response>: Liver glycogen is the first-line of defence against hypoglycemia. The liver concentration of glycogen is about 450 mmol L glucose equivalents after a meal, falling to about 200 mmol L after an overnight fast. After 12 to 18 hours of fasting, liver glycogen is almost totally depleted. 