My tutor tells me off for changing strings to often
I do it every 3 month (100 to 120 h of play) now.
Wow. I change mine much sooner than that--but my hand oils seem to eat through strings. Nevertheless, on my spruce guitar in particular, new strings make it sound half again better--even with frequent re-stringing. So, do you notice an improvement in tone when you put on new strings? For me, it's like getting a new, better guitar every couple of weeks!
When I was shopping for a guitar I once tried a used Kenny Hill that was strung with obviously worn strings. I didn't buy it, and I have no idea what it actually sounded like. Bad strings make a good guitar sound bad.
But I'll stipulate that I haven't played many guitars so maybe I'm off base (but not about my spruce!)
p.s. I seem to be able to keep strings on my cedarTakamine for a longer period of time without losing good tone. What's that about?