I personally keep like 4 weeks cash in a checking account, some traditionally invested that I don't plan to touch for many years, and everything else (12+ months at this point) in an investment account at the same bank as my checking, but exclusively invested in a money market fund with same day liquidity. MMFs are earning around 4+% while fed interest rates are so high, and being able to sell and transfer to my checking in a single day feels like it's basically liquid already.

Since that's the case, I don't want any more than necessary sitting in an account earning 1% or less, just doesn't feel like that much of a difference between investments that can be liquid in 2 hours vs. savings, but my bank is great about quick investment selling and transferring.