Hello @Paul75
Guests get sent an automated message at 5pm (local time) the day before of your check-out instructions as long as you have entered them on your listing of course but I always send my own personalised message via Airbnb as a back-up too.
This is what you'll read on Airbnb re Check out procedure:
We’ll send guests an automatic reminder with your checkout time and instructions. This is sent as a push notification to your guest’s mobile device the day before checkout at 5:00 PM in the time zone where they’re staying.
Guests need to have the Airbnb app downloaded and push notifications enabled to receive this reminder. Once they check out, guests can let you know they’ve left with a single tap or click.
You might want to emphasize why a timely checkout is necessary. “I tell guests the cleaner will arrive at 11:00 AM to prepare the apartment for the next guests, so they understand why it’s important to leave on time,” says Joh, a Superhost in San Francisco.