How long does it keep in the fridge?

Agree that 3-4 days is about right before it will deteriorate

In my experience with both white beans & dips, they keep about 3-4 days in the fridge, for best taste and texture.
Include your make-ahead time in that total e.g., make ahead 2 days and keep 2 days more in fridge.
Sometimes these dishes can be recooked & kept longer, but it depends on whether there are fresh ingredients that would change taste/texture if cooked again.