2 Months Savings vs. 6 Months Savings (re: Prime Directive)

I have been hearing that one really only needs about 2 months of cash in a savings/checking account (I personally use a MMMF (SPAXX)), but I have always been told at least 6 months.

I see the logic in 2 months – you put the rest into the market, and as long as your stocks/ETFs, etc. can go down ~75% or so in a worst case scenario and you still have 6 months of savings on hand, then you are in a secure position.

Just wondering if anyone here uses the 1-2 month cash rule and invests everything else into the market or if general consensus really is 6 months or so, and why you choose that method of securing your finances.