Henry,
After engine start, prime pumps go off, transfer pumps go on.
Paull,
400 Kgs - planning figure about 1:40 by day and 1:30 at night as I need to land above Minimum Landing Allowance.
Actual figure will depend on flight profile - spend a lot of time in the hover = less time. Spend a long time in 50 knot orbit = more time.
As a police pilot you are continually assessing how long you've got left on task.