I've had my 6s since Sept 2015. It reports battery capacity as 86% of new, and still not throttled. I'll probably get the $29 battery replacement before the end of the year, just in case and keep the phone at least another year, if not 2. Previous phone was a 4s, bought Oct 2011. So, I guess I'm saying, "me. I keep my phone that long, or nearly so."