I haven't done ECT since I finished those twelve sessions back in 2013. My M.O. is that I typically don't get depressed unless my anxiety is out of control, and I was able to manage, participate and engage in life until a year and a half ago.
Actually, four years (nine months after I completed ECT) ago I was diagnosed with gynecological cancer (a complete hysterectomy cured me, so I didn't need chemo or radiation), and 7.5 weeks after surgery, I developed sepsis from an internal surgical site and spent five nights in the hospital (sepsis has a 30% mortality rate and I knew this then); less than two weeks of getting out of the hospital, at 1AM, a burglar broke into our house while we were upstairs in our bedroom (H was asleep, I was still awake and heard him come in the back door); thankfully he only got H's wallet, watch and iPod, but even with all those horrible things going on in such a short period of time, I was able to manage my anxiety appropriately. This current round of traumas all started in February 2017. I think most people who do ECT only do it once in their lives; there are some people who, after having that first round, do maintenance ECT. That can look like going every 4-6 weeks for one session, indefinitely. But they know they need to do that because they initially respond to ECT, but then it wears off quickly. Mine did not wear off. An argument could be made that, if I chose to do it again, I could do a series of 6-12 sessions, then do some form of maintenance.