Very short unless that was a design goal! It’s all about temperature. Operate an 85c electrolytic near 85c and it’s not going to be around long. 73 Josh W6XU Sent from my mobile device > On Apr 15, 2020, at 1:09 PM, John Kosko <koskojw at hotmail.com> wrote: > > Two to five year life span sounds a little short to me.