Guacamole does not last long at all. Since it is made out of avacadoes, it turns brown if not eaten within a few hours after being made. If you want to preserve it, try squeezing lime juice on it, or also covering it with lettuce or something. It's actually usually the top of the guacamole that only goes bad at first because of the oxygen hitting it. So somtimes when just the surface of the guacamole is brown, you can mix it together with the rest of the green guacamole - unless it's obviously rotten.
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If you stir a few drops of lemon juice into it, and then place some plastic wrap directly in contact with the surface of the guacamole, it will last 3 or 4 days. If you do not do this, it is much more likely to turn brown (oxidize).
It depends on the fridge's temperature, but if the guacamole still looks green and moisty, you will be ok; if its brownish and looks dry, you should take it away.
One tip: to better preserve the sauce, you should keep the fruit's seed drowned in the guacamole.
5 weeks in refridge, 2 days outside