How many days is unclear. We can probably assume 1-2 weeks.
BNO Newsroom
@BNODesk
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26m
On Tuesday, Hubei province reported the lowest number of new cases in quite a while, but using the new criteria, they actually had 6,528 new cases on Tuesday, not 1,638
“they had 5000 of those cases yesterday”
At that rate that would cover just 2-3 days in the past.
That is scary and worse than I would have expected.
On the optimistic side, some of the “clinical diagnosis” patients will end up testing positive via a test kit and won’t be counted twice in the numbers.