Your emergency funds should be at least 3-6 months of your income so that it can take care of whatever unforeseen circumstances that played out. Whenever, you tamper with your emergency funds to solve real emergency, it should be rifilled back when possible because it's the back bone of your bitcoin investment.
Three to six months is never a guarantee on investment because it might not be sustainable and still create a loophole on the persons investment. When you stack it three to six months of savings you have left the parts were you should have to ask the person in question how much they can save in a month or putting together the total money in six months that would be there because some might not even have $50 on that emergency for six months. in as much as we could say six months is presentable but those who cannot be sufficient on six months has infected the idea, so why not you make out money that can hold for six months instead of saving for six months.