As a relatively recent retiree, my advice is to step back and look at the bigger picture beyond the financials and then formulate a plan that is most likely to help you achieve happiness.
I get the desire to leave a situation where you are burned out, but the absence of pain isn't the same as pleasure, and ending unhappiness with your current work situation won't necessarily equate to happiness in retirement. Do you have a reasonably detailed and realistic vision of what you want to retire to? Does your spouse share that vision? If the answer to these questions is no, I'd start working there first. There are a number of posters here who find themselves disappointed with early retirement (IMHO, often for lack of planning and/or unrealistic visions of retirement) and you won't want to be one of them. Like most things in life, success in retirement is more likely with planning and preparation than without, and that should go far beyond the financial/mathematical.
You mention that you're burned out. That's a good thing to want to change. But, did you ever enjoy your work? If so, is there anything you could do to get your work mojo back? Rather than sit around doing nothing until they lay you off, maybe you should propose some kind of sabbatical or leave without pay, or even a change in the kind of work you do. In the meantime, I'd start making detailed plans for a retirement that would make me happy, probably sooner rather than later.
Good luck!