I've spent a decent portion of the day researching rooms in multiple US cities and every property so far today is showing 3 days' notice. From Florida to NYC to Bumble-somewhere Pennsylvania, all of them are showing 3 days.
[MENTION=2544]neo_781[/MENTION]'s captured what I'm seeing -- Perhaps the policy has been in place for some time, BUT I've never encountered it before and certainly not every single property I search having it.