Share 'putter -lifespans'

I am curious to find out how often most of you are switching out your putters because they are too beat-in........ie......What is your putter's average lifespan before you replace it. I use Discraft d plastic putters for my main putters. I prefer the banger GT but also use a challenger( primarily for very straight or anny putts, jumpers). My preference is for firmer plastics in general......I hav…