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Not sure about US kits, but 50% of people have symptoms in 5 days.

https://www.theguardian.com/science/2020/mar/09/coronavirus-sufferers-symptom-free-for-five-days-on-average-study

The asymptomatic infectious period exists but its length is unknown.

False negatives are definitely an issue, especially if symptoms haven’t started. You need a certain viral load before getting a positive.