6 months is fine in normal circumstances, but if you're going to quit a very safe job and start a company of your own you probably want to have a good deal more

6 months is fine in normal circumstances, but if you're going to quit a very safe job and start a company of your own you probably want to have a good deal more than six months worth of expenses on hand - probably more like 2 years given the current economic outlook. Thing is, it's gonna take several months to develop the product (probably code in this case) and then you have to try to market it and find paying customers - that takes time. And then customers might want additional features and changes. More time. When it's all said and done it's likely to take a lot longer than six months to get to the point where there is some cash coming in. You don't want to be in a situation where you just exhausted your six months cash and now you have to go back to work in the middle of your product development cycle. Give yourself some breathing room and have 18 to 24 months expenses on hand.