I've been using Thomstik Infeld BeBop strings (.013) for several years. The last set I just took off my archtop had been on there since last January (11 months) and still sounded and felt fresh. The only reason I changed them was I thought surely the risk of a string breaking after so much time was increasing, and I'm gigging with this guitar every weekend. If I was just using it at home, I probably would not have changed strings yet. They cost a bit more than other strings, but they're worth it.
