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one year???? I couldn’t handle it. Especially if I played it regularly. They would be too gunky to me. But that’s just me. Like Jumpin’ Jeff said, some like them old and thumpy. But I’ll disagree with him on them not going out of tune. I’m sure if the metal used is not very consistent or of poor quality, they could lose their elasticity and suffer some kind of metal fatigue.
The question you need to ask is, is this one string staying in tune after you retune it? It’s possible that the winds on the tuning peg slipped or it was kinked in the nut or ball end and popped free.
But as for me and my strings, I change them around 3 months if coated, 1-2 months if uncoated when I’m playing regularly.
This is all subject to personal preference.
john