New answers tagged oxidation
Your biggest problem is probably bugs; fruit flies, flies, cockroaches, etc. If possible, get someone to cover the beer and protect it from critters. Cling wrap and an elastic should be enough. Yes, there is a chance that your beer may have become infected (especially if bugs got in). But I would taste before kegging/bottling. If it tastes fine you are ...
My experience with this is limited. I think Palmer talks about this in "How to Brew" (a must-have, IMHO). Anyhow; aside from wild yeasts, bacteria and fungi (oh my!) getting into your fermentor, air contact can also affect the flavor of the brew.
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