The info at https://touringplans.com/universal-orlando/tickets# says that tickets expire 14 days after first use.
But the info on the ticket descriptions at Universal Orlando says (for a 3-day ticket), "Ticket is valid for any three (3) calendar days during a seven (7) consecutive calendar day period which includes the first day any portion of the ticket is used. "
Those seem to be in conflict – which is true?