Preferences on timing a visit can be expressed with preferredTimeWindows. This concept lacks the distinction between meeting a preferred time (10:00-14:00), meeting a preferred day (Mon - Tue) or meeting both. For our clients, we need to make this distinction as they can express their preferences on visits on these dimensions.

Meeting both the preferred time and the preferred day (Mon, 11:00) is always more desirable than only meeting a single preference (Monday, 09:00 or Friday, 13:00).