On average, less than one a day. I don’t drive daily, so I use a fraction of a car key. We enter and leave the house thru the garage, and I don’t think we even have a front door key. I never had an office key and I don’t work any more anyway. I know where Mom hides her house key, but I can’t recall the last time I went there and no one was home.
I do have the key to my daughter’s house and I might need that once or twice a month. Maybe. So all told, less than one key per day.
Our neighborhood is nearly 40 years old and we have those. It’s more for the convenience of the mail carriers than the homeowners. It does however make the street look a little more tidy without everybody trying to express their personality through their unique (ugly) mailbox.
I have three home keys: One for my building, one for my apartment, and one for my mailbox. Then, I have one for my bike lock, and one for my classroom. On a typical day, I use all five of those.
One one or two days per week, I visit my mom, and so also use the key to her house, and the key to her barn. And I occasionally need to use a different key for her house.
About once per week, I drive, and so use my car key. I unlock the doors with the fob, but I still need to stick the thing with teeth in the ignition.
I also regularly use my ID badge at work to get into the building, but I gather that that doesn’t count as a “key”, for the OP’s standards.
We put a code lock on the front door about a year and a half ago and I don’t think I’ve used a physical key since.
Both cars use a fob, my office (until I retired three months ago) used code locks, and those are the only locks I ever use.
The funny thing is that I still carried a ring of keys until a few months ago, purely out of habit. Aside from the old one to the house I couldn’t tell you what any of them opened.
Up to 4: house key, car key, 2 at work.
On days when i drive, i use the car key. I drive maybe 2-4 times a week. On other days, no keys.
I carry a bunch of keys with me, but there’s really only one I use daily: my mailbox key.
Average is about 0.2. just the house key, and only on days when my wife and I leave the house together.
However my wife uses about 88, since she’s started practicing piano again.
None. I’ve had digital key pads on this house and the last, so 20 years or so. The car key technically has a metal key inside the fob if the battery dies, but I have never used it. Mailbox is on the front of the house next to the door, as God intended.
But based on the constraints in this thread, only when she plays the music of Matthew Locke.
2. House key and car key that’s it. My cars older not a fob job.
Throughout Canada, all newer neighbourhoods are served by community mailboxes, basically a cluster of mailboxes serving more or less the local block, with lockable compartments for packages, and with a slot for outgoing mail. It’s an enormous efficiency in mail delivery – one quick stop for the mail delivery person instead of walking around to 30 or 60 houses. As a compromise with the postal union, mail is still delivered door-to-door in older neighbourhoods, but I’m sure this horrendous waste of time is gradually going to be phased out.
Certainly not: the mail recipients will do several times as much travel to the central mailbox as the carrier saved. The way to get efficiency is to switch to electronic mail. Denmark is headed in that direction:
although another company will still deliver them.
The only key I use daily is my car-key. I don’t lock my house doors except at night when I am inside.
So, one. 
Only my car key if I leave the house at all. Well, our mail is in a ‘gang’ box, so if I check that I’ll use that key.
I used more as a kid/tween. We owned a mobile home park (grandpa built it). I worked there and there where a lot of buildings and vehicles. I hung them from my belt loop (and man did I feel important, ha)
Minimum in 1 day: key to apartment and key to truck or car (whichever I’m driving that day). Unless I don’t go out at all on a day, in which case none.
However, I routinely carry a bunch of keys: key to apartment door, key to document lockbox (home), key to truck, key to car, key to PO box, two keys to off-site storage unit, and a key to my locker at work all of which usually get used at some point during a typical week. So seven in all.
At work I have a key for the cash office if I’m working there, and two keys for the self-checkout machines so I can clear jams in the mechanisms.
So… clearly I’m not living in the keyless future. I’m OK with that. I also fully support the position of those who are key-free fob-loving folk. Options are good.
Oddly enough, despite living in an apartment, I don’t have a key to my home mailbox. It’s an unlocked box just outside my door.
I now feel like Opposite Girl in this thread.
Five or so days a week: two keys each used twice. Car, store in am, then store, car in pm.
A few times a week there’s the store mailbox key, and the nightdrop bank deposit key.
Hmmm … If using a key = just turning a key that lives in the lock, then add in umpteen times in a normal work day. There’s a drawer behind the cash desk that needs to be opened with a key but there’s nothing really secret in it. I use that all the time.
One house key unlocks all the doors.
One car fob I keep in my mini bag, I don’t even need to touch it, just a tap on the door handle locks and unlocks it. I can also access controls from anywhere using the app.
Two keys for the door to my flat, one for my car, and one for my office if I’m the first one in/last one out. Plus two remote controls to open the parking lot gate at home and work, and my fingerprint to get into the office building.
I can’t remember the last time I used a physical key. Must be years for sure. Maybe an Airbnb in Barcelona 2017. Maybe my credenza at work around that same time.
I have house keys that we have given to the dog sitter just in case of an emergency. But haven’t used them myself. He uses the numeric keypad.
That reminds me that I need to look up how to open our new car’s door in case the keyless entry fails.