Rig tuning: At least annually!
This is like checking the air in your car tires, it shouldn't be a big deal. You buy a tension gauge that matches the range of your rigging
, you beg, buy, or steal the specs for your boat and if you can't get them, try to make sure all the rigging
is the original size and tension to the size of the wire.
On some bendy boats like the J/24, racers may actually re-tune to match the wind
conditions from day to day for racing
. For cruisers and casual sailors? Once or twice per season should be plenty adequate. It isn't hard, and it assures that you will be eyeballing the fittings for potential failures.
None year old rig is also time to check for meathooks, if there are ANY then you're close enough to ten years and potential problems to talk about re-rigging.