In the outskirts of a college town with unusually bad retail (like the clothing stores at the mall are the Loft, Target and T-shirt express) 2 day shipping became 2 week shipping during the pandemic leading to me to quit Prime. It particularly bugged me because if I expect to get something in 2 days that's more convenient that making a trip to the store, but if it 5 days or more I'll be going to that sector anyway for another reason and it is easy -- it struck me as significantly dishonest that they were promising fast shipping and not delivering.

Maybe 2 years later I tried the free trial of Prime, if only to quiet the ads, and it was great... they must of extended their logistics network into my area and I get a lot of stuff in 1 day or 2 days now. I went through a phase of taking discounted or free Prime offers when I could but broke down and I've been maintaining a Prime subscription. It's probably not really worth it because my pattern is that I am typically heads down doing this or that and every other month or so I do a burst of buying stuff that I'd wanted for a while or I am doing some project that requires a lot of stuff. Then I might go a month and buy nothing on AMZN.

It certainly varies at least by country. I'm in London, and its very unusual to get worse than next day delivery except for marketplace sellers, and often <12 hours.