I'll play. Pure speculation.

1. 30 days.
2. 45 days.
4. 3 months.

Some conjectures. Implementation of temperature testing en masse, such as in Asia. When testing capabilities are sufficient, test liberally and surgically isolate individuals and pockets with infection rates--positive test carries the rule of law where coercion may be used. Quarantine all those in the high risk demographics. Mass produce some masks, if only to reduce the potential asymptomatic/unwitting spreading. At the risk of pulling a Bloomberg farm thing, how hard is it to make masks? Can't anyone with a sewing machine stitch one up?

Mostly, in my view, Americans will find this cowering stuff tiresome pretty soon. I suspect we're ok with 30 days, but, not much more. Life goes on, regardless. It's not necessary to eliminate this thing, just do our best to avoid the healthcare bottleneck. We ought to be able to practice vigorous mitigation without placing our lives on pause by taking a page out of the SE Asia playbook.