I think I replaced my razor blades once since posting this thread...? Definitely not more than once. (I use a Gillette Fusion Power for my face and a Headblade for my head.) It's so infrequent it's hard to keep track.
Do straight razors ever "wear out"?
I shaved with the same straight razor 3-4 times a week for close to 20 years, and my father had owned it for at least 5-10 years before he gave it to me. I gave it three swipes on the strop before each shave, and once every couple of months, I gave it a pass on the hone (fine grit sharpening stone). I went full-on Mr. Clean for about 5 years, and pretty much shaved everything from the neck to the crown of my bean with that blade.