The average unit tour interval by surface ship type over the last five years, defining a tour as a ship being away from its base port for more than three months, is as follows (rounded to the nearest month):
Months Land Platform Dock 17 Landing Platform Dock Helicopter 20 CVS 31 Destroyers T42 16 Frigates T22 14 T23 16 Mine Counter Measures Vessels 17 HMS Endurance 5
Exceptions:
Survey Vessels have up to five year deployments.
River Class Patrol Vessels on Fishery Protection undertake eight week (approx) taskings.
Falkland Island Patrol Vessel permanently deployed.