I think its a minimum of 3-6 months in a place where you can access it on short notice. of course the most common advice I see around LW, and other "If I knew this when I was 20 years younger..." type posts is - its never too early to be saving money up and building wealth.
This thread is for asking any questions that might seem obvious, tangential, silly or what-have-you. Don't be shy, everyone has holes in their knowledge, though the fewer and the smaller we can make them, the better.
Please be respectful of other people's admitting ignorance and don't mock them for it, as they're doing a noble thing.
To any future monthly posters of SQ threads, please remember to add the "stupid_questions" tag.