How much do lions eat at one time?

A male lions needs to eat 15 and a half pounds of meat a day. A female eats 11 pounds a day.

hope this was better than the previous answer
Lions generally only make a kill every two to four days. When they do have a successful hunt, a lion can eat 66 lbs in one sitting! The average daily amount that a male lion needs is 15 lbs and a lioness needs 11 lbs.
Around 10 to 15 pounds of meat a day.

up to 7/10 of their body weight. they tend not to however because the digestive process requires them to sleep for a 12 hour period which could render them prone to predators