Tough question <_< , the obvious is that we have to recommend a time frame for maintenance, what is not so obvious is the who is reading this recommendation, some folks do very few photo dives in a year and are maniacal about maintenance, other are photo pros on live aboard that are day in day out in the water and have little free time for taking care of the gear cause theyre busy pampering us
in between, there is a a brochette of situations. My take on this is, do not neglect your stuff and if neglecting it is innevitable, then learn to do your maintenance yourself.
The most frequent causes of problem are linked directly to the user not rinsing long and good enough. if you pay attention to your equipment you will learn to discern when controls are getting stiffer or sloppy, better yet read between the line and schedule yourself a realistic maintenance schedule, one based on your need.
i'm affraid its not a thing you can slap a number on, oh and BTW, please if you are planning a dive trip in a few months, don't wait the last week to verify your gear
, give your gear a pool run at least a month prior to the trip to confirm everything is green to go.
If you are insecure about your schedule, contact your dealer or your manufacturer and discuss it with them, after all we made the thing in the first place and customer support start by you picking up the phone or dropping us a line.