I'd like to add my anecdotal report.
I restarted steroids 1.5 years ago, around July. I cruised on roughly 125mg and had one blast of 500mg test e, and in April the next year, I wanted to make sure I was fertile as my wife and I wanted to try for a baby. I started taking only 250iu EOD, and in October I got a sperm check as we still hadn't gotten pregnant by then, and my sperm was completely normal and healthy.
Obviously I hadn't checked my sperm before the HCG so it's not super relevant, but I know that my sperm was fine after taking only 250iu EOD for 6 months, after already being on gear for 9 months prior with no HCG.