Hardening - Group A (zinnias) - 25-35 minutes in full sun (rest of daytime outside in shade)

25-35 minutes (full sun; 10:55am is when the sun started on the west side of the trays, 11:05 is when the sun reached the east side of the trays; moved into shade at 11:30) (trays were on chair/table in their proper place and on the two containers at feet)