I think that each and every filter associated with an individuals tank is going to require its own cleaning schedule based on all of the variables involved in aquaculture.
Start by checking every two weeks, if clean then once a month, if clean then once every two,three,six, months ...
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Thats the idea.
If you have a planted tank then I would problably not worry about Ammonium (NH4) released from your filter as It is often prefered by many plant species to NO3 as a source of N uptake. But if you have no plants then you should clean the filter before six months to prevent algae.
Drain some tank water into a plastic tub/bucket/pan that you use only for tank maintenance and pull the floss out and gentle shake and agitate it to release the larger particles and put it right back into the canister if you rather not put in fresh floss.