Out of curiosity, I did some research and went back through the NZDF Annual Reports to total up the actual sea days recorded by the RNZN fleet. I only checked the reports I could find online, which are from FY 2002/03 [1] on. The most sea days recorded by a single ship was 198 by Resolution in FY 2004/05. Some ships have managed >170 days on occasion (the ANZAC frigates during the Gulf deployments of Operation Enduring Freedom in 2003 - 2004, Endeavour & Resolution twice). Reporting for individual ships stopped in FY 2009/10, with just totals for the capability groups (ie Naval Combat Force, Offshore Patrol Force etc) up to last year, FY 2013/14, after which they have stopped reporting sea days as a metric altogether.
Sea days are not a perfect measure, covering anything from an overseas deployment to a training day in the Waitemata, but I suppose there isn't a better measure for how much the Navy is "out there, doing it".
The records for the combined littoral operations & hydrography capabilities (ie Manawanui, Resolution & Kahu) are as follows:
FY Actual Sea Days (Total)
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2002/03 307 [2]
2003/04 346
2004/05 460
2005/06 339
2006/07 422
2007/08 391
2008/09 378
2009/10 344 [3]
2010/11 232
2011/12 254
2012/13 111 [4]
2013/14 118
2014/15 not reported
So the data suggests that an expectation of 200 sea days a year from one ship seems optimistic, and that the Navy could potentially require more than 400 sea days a year from the ships assigned to these capabilities (assuming the current climate of austerity eventually passes & hydrography work resumes). As always there are some caveats:
* It should also be noted that although Kahu was assigned to the Littoral warfare group, she was often used for seamanship & navigation training.
* The Navy acquired the LINZ hydrography contract under a grandfather clause (the government had decided to make the work contestable). It is debatable whether Resolution would have been purchased if this had not been the case. She usually operated over 100 sea days annually in service of the LINZ contract.
Notes:
[1] New Zealand financial reporting is for the year ending 30 June.
[2] Doesn't include Kahu (which was not counted in the Littoral operations support force at this time).
[3] Kahu decommisioned Oct 2009.
[4] Resolution decommissioned Apr 2012.
Chis73