Hi Kelly
Are you able to share you plan? We have a basic one, but it would be nice to compare with others what's in place.

Hi Linda
NZTA has some good information:
https://www.nzta.govt.nz/safety/driving-safely/fatigue/fatigue-resources/fatigue-calculator/

HSE Managing Shift Work Hours has useful information also.
http://www.hse.gov.uk/pUbns/priced/hsg256.pdf