We noticed that (and other things) a while back. My wife bakes all of our bread using caputo flour imported from Italy (doesn't have glyphosate, properly milled etc). If it is just left on the counter, it might last for 2 days. If you put it in the fridge, it can last at least 4 days (we have never had any sit around longer because we eat it all).
The other things that real bread made from real flour doesn't do is destroy your gut lining and make you put on weight. It has actual nutrition, you feel full and satiated after eating a little bit of it and you just feel happy after eating it. It is like being in the 70s.
I made some bread Saturday evening. It's Monday, and it would probably have one more day before it's really stale, another before it's bad.
All them yummy preservatives in store bought stuff.