Since new rigging stretches, replacing only one of a pair of shrouds will make it difficult to keep your rig in tune.

You should “pre flight” and “post flight” your rig before and after every sail. Every time you sail in more wind than you have sailed in previously with your new rigging, it must be re-tuned.

Since rigging fails inside of the end fittings where they cannot be inspected, prudence dictates that standing rigging be replaced every seven years for boats sailed in salt water, every ten years for those sailed in fresh water.