Estimated check-in time: day

[Raboo]

Hey all,

I have a question about Estimated check-in time in Insert a new reservation.
I understand the concept of time, but I do not understand why you have the day option with the choices 1-7 there?

You check-in the same day that the reservation starts, isn't that so?
So why do you need to enter day 1-7? And is that weekdays? monday-sunday? What should I put if I want the check-in to be the same day as the reservation starts?

For me it's only interesting to see if the customer checks in before 19.00 or after 19.00.
Whats the best way to setup that?