I have read one or two weeks before, but have kept it for three weeks with no problems. After that it started to separate a bit, but was still tasty, and I assume safe since I'm still here. I use the EverydayMaven recipe with avocado oil from Costco. http://www.everydaymaven.com/2014/h...ake-mayonnaise/ , made in a straight-sided jar with lid to store it too, only need to clean off the blender when done.