Investigate first
Utah starts with an investigation. The notice duty follows only "If an investigation under Subsection (1)(a) reveals that the misuse of personal information for identity theft or fraud purposes has occurred, or is reasonably likely to occur."
The text we checked describes that investigation as reasonable and prompt. Where it finds misuse neither happened nor is reasonably likely, no notice is owed.
When notice is owed, it goes out "in the most expedient time possible without unreasonable delay". Utah sets no day count.