Originally Posted by
The Road Goes On Forever
The point is that while you or anyone else want to apply your own arbitrary "point in the evening", "8pm", etc. there is no verbiage stating how late is too late or low long is too long which brings us back to why the property is doing what they're doing. You could repeat this situation at ten different properties and you would get ten different outcomes because it's all up to interpretation as to how long is too long before compensation, action, URG, etc. should apply.
You seem unfamiliar with the doctrine of
contra proferentem, under which a contractual ambiguity is interpreted against the party that caused it. (See, e.g., Cal. Civ. Code section §1654.) This holds with particular force in contracts of adhesion, which the Bonvoy T&C most certainly is.
Although in this case, you don't even need to get to that rule, because contracts must be interpreted to give reasonable effect to their terms, and the interpretation you're promoting is patently unreasonable and would render the UG illusory.