We will know in 2 weeks. Everyone has been saying 4 weeks for the last three weeks. The moment of truth is at hand, the time cannot be perpetually moved for the good of making a point to panic.
If you look at the Chinese data, when people finally were tested, the majority of them said they had been sick for at least two weeks. So, you may be looking at a month or more for a window.
Since we’ve just started widespread testing I’m sticking with three to four, but your numbers may vary. Our local hospitals are taking it very seriously as are our personal doctors. I’m not panicking just being prudent. My wife is already on oxygen, she’s ground zero for this.