The typical rule is to have 6 months of salary saved up in case of a life event that derails your income.
I was just an individual contributer at Nike, but I always have tried to live and invest as if something bad (like a layoff or medical scare) is always around the corner. Therefore, right at the moment, I am fortunate to have around $100k in my checking and savings. I have another $100k in stocks I could sell right away, as needed. And that is before getting the severance package, final paycheck (with PTO cashout), and whatever PSP bonus might happen, which should net another $100k after taxes. So, I should have about $300k in cash and liquid assets to live off of until I can find a new gig. My expenses are relatively low, and I have a significant amount of long term assets I could tap if it comes to that, so I should be fine... even in this disaster of a job market.
I hope that others have a similar cushion, but I understand your situation (from my own past experience) if you are at a different stage in life and haven't had the ability to store money away like this yet. It took me more than 10 years to get to this point financially.