How long after eating does it take for your stomach to become empty?

20 minutes if you are in tip top condition. But it's safer to wait a few hours.

It depends on what you eat. If you eat meat it takes a lot longer for it to digest. Like Cap said too it all depends on how healthy you are as well.

Many people wonder this due to medications that must be taken on an empty stomach. If such is the case, rule of thumb in the medical community is one hour before meals or two hours after.