Fatigue,
Police hele pilots work a variety of shifts, depending what the police forces want, what the CAA will allow and how many pilots are in the ASU roster. Shift length between 9 and 12 hours. Patterns vary but are based upon normal FTL rules with one or two special changes, pretty similar to any public transport operator.
Most work day and night (for fairly obvious reasons) to do with the demand for their services) but at least one only works a day shift at present. Some work 24 hours, others slightly less than this.
The rules are in the CAP that is the PAOM Pt1. You can get a pdf copy from the CAA website of Issue 2, although the few changes in it do not come into effect yet.
Unless you explain why you want to know, people may be a bit reluctant to give full details
Helinut