I would say every 3 Days or so
Every 3 days? I'd be out with the house vacuum cleaner vacuuming the driveway to scare them away if my door was being knocked on every 3 days.
Maybe once a year to once every 2 years I get someone knocking on my door. I can actually count them, 5 times since I moved here in 2017.
Deaf neighbor knocked gesturing to me twice, wanting help with something. First time was he wanted to trim all of our trees running down between everyone's property (trailer park) and once needing help working on his side-by-side.
His neighbor's daughter knocked selling hoagies with her daughter. I've been out in the yard all the other times she's come by.
Was the neighborhood
Amazon central distribution center for a Christmas season, or at least Amazon thought I was. Neighbor knocked on my door when she realized I was getting all her packages and leaving them for her. She called twice, I called twice plus talked to 3 drivers and couldn't get it to stop. The first driver put a remark in the GPS. The 2nd two drivers said, "yeah, I saw something in the GPS..." Then why did you STILL DROP THE PACKAGE HERE?!?!?!?!
5th one was a girl across the road who use to own my place. I'm on the corner and my side road, her road, was blocked from them doing work so she was letting me know why she was parked in front of my lot.