Hi @Pauline70,
Welcome to the Community Center!
Just to let you know that I have moved your post here to a new thread so that it doesn't get lost in another discussion! It will be easier for others to find it here and give you advice.
In terms of your question, it sounds like you may have a maximum length of stay set to 9 days and that is why your guest can't book for longer than that. This Help Guide explains how you can change the minimum and maximum length of stay.
Hope that helps, let us know how you get on!
Kirstie