If someone is enquiring to book for the following day, 24 hrs is too long to wait to see if they confirm the booking. I think it should be reduced to 12 hours! Especially when after contacting them and preapproval the majority don't even bother to get back to let you know!
@Helen403 maybe so, but I suppose they have taken time differences into consideration with their 24 hour window. And a pre-approval does not block your calendar, others are free to book unless you tick the "block the calendar" box. Personally, I would not block my calendar for those shopping around last minute.