Hi @Pille0 The Airbnb calendar won't support that type of action but you might be able to work around it a bit. YOu must use the desktop version, not the app.
Go to your calendar, then Availability Settings, then Reservation Preferences, and set your minimum number of days - in this case 5 days. Then you have to go into Add A Requirement, and the bottom tick box is Check In (click the check) and you can put what day guests must arrive. This only works for either Sunday to Thursday, or from Thursday to Sunday, as you can't add TWO separate days of the week that guests must arrive.
In your specific case, I don't think it will work well, as the Airbnb system is designed for nightly rentals, so there is no way to say that a 5-day stay is $1,000 for example. You'll just have to play with the limited settings until you find something that you can live with in terms of pricing/minimum stays and arrival nights.
Good luck to you.
