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Is there a good rule of thumb for how much I should have set aside as emergency cash?
The main factor should be what sorts of emergencies you are trying and also need to protect yourself against. Overall I'd say at least 6-9 months of expenses, adjusted for the above factors. More might be better but I'd probably keep that in a different type of investment vehicle, mainly because it doesn't really need to be accessible instantaneously like your normal emergency fund would need to be.