0315 start time? What sort of nonsense is that???
We do
2x 0700-1430
2x 1430-2200
then either:
2x 2200-0700, sleep day, three days off,
or 2x 1000-1900
or 2x 1330-2030
or 2x 1530-2300
and four days off,
or one day off, then 2x 0630-1330, and three days off.