The setting is accessible via Property's Main Settings tab in Hostfully Property Management Platform - PMP.
Vrbo does not do same day bookings
For Vrbo's Booking Lead Time, it's date-based calculation, not time-based calculation, so if the Booking Lead Time is 1 day and check-in is on Friday, then guests can book event on Thursday 11:59 PM.
If the Booking Lead Time are 2 days and check-in is on Friday, then guests can book till Wednesday 11:59 PM.
About rounding up from hours (in Hostfully PMP) to days (Vrbo):
If Booking Lead Time is 0, it means 0 day pushed to Vrbo
If Booking Lead Time is between 1-24, it means 1 day pushed to Vrbo
If Booking Lead Time is 48 / 72 / 96, ..., it means 2 / 3 / 4, ... days pushed to Vrbo
Airbnb, Booking.com and Direct Bookings
Let's use an example of a property with a 3 PM check-in time.
--If you set the Booking Lead Time to 1 hour, the latest a person will be able to make a reservation is at 2 PM that day, 1 hour before check-in.
--If you want to allow someone to make a same-day booking, but after check-in time you will want to use negative numbers for Booking Lead Time.
For example, your check-in time is 3 PM, and you want to allow someone to make a booking all the way up until 8 PM that night (maybe they got in late and need a place to stay last minute). You know the place is clean and you can offer them access.
In this example, you would want to enter -5 since your check-in time is 3 PM and you want people to be able to book 5 hours past your check-in time.
If it's not a same-day booking, Airbnb only allows a booking lead time of midnight for 1, 2, 3, or 7 nights before check-in. For example, if you choose Booking Lead Time of 24 hours, it would be 3 pm the day before. That works for direct bookings, but Airbnb does not support that. We round up, so in this case, the Booking Lead Time would be 2 midnights before (39 hours before check-in).
Note: if the checkbox of "Allow booking request" is chosen, guests who don't meet the Booking Lead Time requirement are not able to Instant Book, but can still send a booking request, and PMs can accept or decline accordingly.