Coronavirus: We may need 28-days of no cases to eliminate Covid-19, move to level 1
Public health expert Professor Michael Baker thinks that, from an epidemiological point of view, two 14-day incubation periods with no evidence of new cases would provide health experts with a "high level of certainty" the virus had been stamped out.
It could be earlier, going by onset dates of recent cases, which were almost always earlier than the reported date. Once elimination was confirmed, then the alert levels could relax, the University of Otago professor explained.
Director-general of health Dr Ashley Bloomfield hasn't put a timeframe on our stay in level 2