3 ms·The keto flu lasts 1 or 2 week maximum if you do everything wrong. And it's pretty easy to fix.by ddorian43 3y agoThe keto flu lasts 1 or 2 week maximum if you do everything wrong. And it's pretty easy to fix.chasebank 3y agoKeto flu is essentially solved with proper electrolyte intake, correct?ddorian43 3y agoYes.