@Jonathan978 As far as I've been able to deduce, it doesn't actually block 2 days between bookings- it blocks one- so a guest can book 2 days after your previous guest leaves, and the "one day after" doubles as the "one day before" the next booking.
It's also helpful to think of them as nights, rather than days.
Guest A checks in on the 1st, and checks out on the 3rd. The night of the 3rd will be blocked as the "day after".
Guest B can book the night of the 4th, the 3rd will be his "day before".