It takes 2-21 days for the first symptoms to appear (98% of the time - on rare occasions, it's over 21 days, but CDC ignores that in their protocols and in their model). From the first symptoms, it takes 1-4 days for the initial low fever to reach 103 degrees F, and often 1-3 days after fever hits 103 degrees F before ELISA and PCR tests can confirm the diagnosis.
OK, then suspected cases should be confirmed in anywhere from 2 to 7 days.