NOTE THE ABOVE INFORMATION IS WRONG - cannot edit or remove
If you have selected "Advanced Notice" but also check the box below that says "allow for Instant book", your property will show up for qualified Instant book guests (depending on what level of guest requirements you've set) to be able to book
UP TO MIDNIGHT OF THE SAME DAY.
Let me repeat, that your property won't just show up in search so that it can be requested, if the seeking guest meets your IB qualifications, they can book. You do not have the option to also create same day cut off hours. So someone who qualifies can book at 11:50pm and expect to show up that night.
This means only guests who do not meet your guest qualifications can request to book but you property will not show up in search if it is within the Advanced Notice timeframe. They may still be able to find you and request, but if they qualify for IB and you have checked the box, they can book even within your Advanced Notice timeframe.
Uncheck the box if you really want to have Advance Notice and not take reservations within that timeframe if you use IB.