I had only very minor issues with discontinuing HRT - a couple of mild hot flashes. (I was emotionally all over the place, but since GRS was 3 weeks away and I was terrified of any kind of surgery, I think that was to be expected!) Not sure what my T level was b/c it wasn't tested, but my guess is not much, since pathology reported that my testicles were nonfunctional anyway.
We got the OK to restart HRT the day we left the residence, which was day 10 if I count the day of the operation as day 1. So it was, of course, actually about 31 days off... but honestly, post-op the LAST thing I was thinking about was hormones. I was too busy caring for the new bits! I even, um, forgot to put a patch on until the next day I was home. 🙂