We just moved and have had a number of deliveries and appointments at our house etc. We have had numerous times where we were given a window, then given a smaller window the night before. My wife and I plan for who can cover what times. Then they call an hour to two early and say “hey, we are at your house.” Haha, ok, have fun waiting there for an hour until I get home. They don’t care, they’re mostly laborers and are happy to nap in their truck for an hour.
We have had most within the window.
On the late side of the spectrum, we only had that once. I got a peloton for my wife for Christmas ( 😂 semi kidding, she asked for it). The smaller window was 3:30-6:30 and they showed up after 9:30!