We do have an option "Advance Booking Period (in hours)" in our Booking plugin which is located in the Availability tab of our Booking meta box. This option enables the booking X number of hours before the actual booking date/time. If you want to allow booking 24 hours in advance then you can set the value to 24 to “Advance Booking Period (In hours)” and then the current booking date/time will be available to book until 24 hours before the booking date/time.