Yes, a bit too long.......
I watched a Cyclon fizz the other day after being put into vinegar - due to severe limescale build-up. There's abuse in use and then there's ABUSE due to neglect and lack of servicing. The bronze filter was vivid green too. I know of another case where a Cyclon was condemned due to it being uneconomic to repair - to be fair a 13 year servicing interval is a bit long.
I'm glad that you spend on servicing, although sad that its a fortune! 5 Cyclons sounds a lot..... what are you doing?
5 cyclons - 2 backgas, 2 stage, 1 recreational maybe?
Servicing isn't just about swapping out parts, whilst this is important, proper cleaning and lubrication prolong the life of the regulator and keep things moving smoothly with out causing damage to the sealing surfaces inside. (in fact you would be suprised at how little is changed at a service with some regs. Somethimes maybe 4 orings and a filter!) I am often amazed at how much grease is sometimes used when regs have been serviced, takes ages to clean out properly so that the dynamic orings can actually move as they are supposed to...
The bronze filters are a pain, especially in the red sea (high salinity) the tips start to discolour within a week.
It is also very easy for water to enter the 1st stage without you realizing (when rinsing etc or when on stage tanks) You only find out when you open the 1st stage and see everything crusted together!!
Yep, I can see how 6 monthly servicing soon adds up....
Cyclones are easy to service apart from the 'puck' which needs a special tool to take it apart and reassemble (sort of like a press)