I expect it will take a while @soyrosa. If the intention is to isolate everyone until the "free" viruses become inert (on some surfaces they can infect for up to 10 days without a host), AND until everyone who is infected is is either well again or dead... that could be another 4-6 weeks.

If we say 6 weeks... that's almost 12% of a year; that is a LOT to lose in a business, not to forget what has already been lost before the complete shutdown.