@John8854
You really do need one day before and after, to ensure you have at least one day to clean between back to back bookings:
Reservation One
Checks in on 4/2 thru 4/5
Reservation Two
Made after reservation one
3/31 checks out 4/2
You now have one guest checking out on 4/2 and one guest checking in on 4/2. This is why you need one day before and one day after each booking blocked to prevent same day turn arounds.
Advance Notice
You might need to take a look at your Advance Notice settings on your calendar as well. One day advance notice is not really 24hrs. A guest can book a stay tonite at 11:59pm and still arrive the next day for check-in.