whoa I think you're getting a little ahead of yourself. Please read ALL of the posts in here:
http://jlcollinsnh.com/stock-series/Don't wait to invest until the next recession. No one knows when that will be. Statistically, you are better off putting your bulk sum into the market now. Read this:
http://awealthofcommonsense.com/2014/02/worlds-worst-market-timer/ It really sounds like you don't really have a firm grasp of your situation (what is your annual spending? Where is this $600k sum coming from, do you have other assets you didn't include above? You ask about investing during the next recession, with what cash? Do you know what funds you are currently invested in?) or how to handle creating income streams yourself. Slow down, read more information, and is there a reason you are quitting in the spring? Can you wait until you have things properly set up before pulling the plug?
I worry because you only have $90k in the stock market. The bulk of your net worth is tied up in cash and a house, which doesn't rise in value like the market does, so your retirement math is significantly different than most here.
Also, I'm not really following your math -- your INVESTED assets would double in 10 years, not 5.
https://www.investopedia.com/ask/answers/what-is-the-rule-72/ using the generally accepted 7% stock market return. This is only for assets invested in the stock market, not cash or real estate.
Do you understand how taxes will have an impact on your FIRE number? do you know how to utilize tax-advantaged accounts to streamline your tax burden?
you say you maybe want to dabble in real estate, do you know how to find a property and evaluate it's cash-flow potential?
DO NOT EVER cash out your 401k. Terrible idea because if you cash out, you'll have to pay full income taxes on the full sum that way. IF you are leaving your job, and IF you are unhappy with the 401k fees and want lower fees, you roll it over into an IRA at the institution of your choice. Around these parts that is Vanguard or Fidelity. Don't touch any of your 401k funds for the foreseeable future.Taking a loan against your 401k for living expenses is similarly a terrible idea.
fwiw, my DH and I are planning a similar path: build up our invested assets to half of our FIRE number, then drop down to part time work to sustain our living expenses until we hit our FIRE number. What you are planning is not unheard of, or outlandish, but you really need to make sure your preparation is correct before doing it. You sound really excited, but not really prepared. Please take some time to make a more solid plan for the future (currently you have plans all over the place) and set up your accounts/holdings to properly support that vision - are you going to sell your house? Will you buy another house in a new location (that will tie up assets that you can't live off of)? What are your projected living expenses in the new location? What kind of job would you get? When do you need to get a new job? Do you have a family (wife, kids) planned for the future, because you need to take that into account also?
I say the above out of concern for you, I don't want you to get yourself into a difficult situation because of lack of preparation.
