According to the ECT people I've had 51 treatments. However only the first few were real treatments - the last 45 or so they just tricked me into undergoing anesthesia so they could remove my memories without the mood benefits ECT has. That's the reason the first few did have some effect (I'd quit eating and drinking and stared into space all day, after a few ECT treatments I started eating and drinking again) and the others did not.