If it's true that there is a three week latency period while you can still be infectious then we are screwed. There's basically nothing you can do because quarantine becomes impossible short of forcibly quarantining everyone.

If even Xi Jinping doesn't have the political cover to pull it off, the US political leadership surely won't.

The absolute highest outlier (like, only one case so far) seems to be 27 days, with the vast majority being under 5 days.