Name: Sandy B. Ford River Twp, Michigan UP (Zone 4b) (Zone 4b-maybe 5a)
I don't know what the maximum number of days would be - but right now mine have been "out in the light" since January 24th and I won't be planting them until at least mid May.
“Think occasionally of the suffering of which you spare yourself the sight." ~ Albert Schweitzer C/F temp conversion