We’ve done the “How much cash do you stash” a few times. Usually as an offshoot of “How much cash do you carry or spend in a week / month.” Here’s a recent example:
I usually have a small stash on my person, a larger one in the car, and a larger yet one at home. Setting aside the unreality of the overall set-up I could buy basic groceries (and only basic groceries) for much of a year. OTOH if I also had to pay rent & car payments and … then I’d be broke before the month ended.