all of the "daily quest" motifs since Senchal, seem to have a 20-hour cooldown.
I've gotten one a day, fairly consistently, so any time I get a motif, I just leave my other coffers unopened until tomorrow.
Shortly after the formation of the Ebonheart Pact, a Nord woman was given a tour of the Tribunal Temple. When later asked about the experience, she seemed upset. Suffice to say, the Dunmer were not pleased to hear this, and thus they inquired further.
"Well," the Nord frowned, "the priests were very angry and unwelcoming. They kept shouting things at me like "you can't drink that mead in here!" and "somebody stop her, she's running naked!" and "we can't catch her; she's covered in grease!""