First day back would be May 4th which is 7 weeks after it started. If they feel the need to make it 12 weeks they still could, and that would put traditional schools out through the end of the school year. It just won't be any sooner than May 4th. 12 week mark would be June 8th.

Timeline range for the phases:

Stabilization phase begins sometime between May 11 and June 8 (8-12 weeks after March 16)

Recovery phase begins sometime between July 20th and September 14th. (10 weeks from May 11 to 14 weeks from June 8)

Things back to "normal" sometimes between September 14th and November 23rd (8 weeks from July 20th to 10 weeks from September 14th).

That means "best case" would be going back to our "normal" lives by mid-summer with economy starting to rebound by end if summer. "Worst case" would be going back to our "normal" lives by end if summer with economy starting to rebound by Thanksgiving time. That is if things go according to this "plan" which isn't a certainty either. Regardless, we after likely in this for the long haul. Just how long has yet to be seen.