Some say it feels like it takes weeks to feel good after a phlebotomy, so experiences vary. Some find it hard to restore iron levels, can take months.
From my readings it seems high red blood cells aren't necessarily dangerous (within limits) and blood donation hasn't actually been shown to reduce any incidences of CV problems which were the result of TRT (not enough data obviously). Some bodybuilding "experts" advice to do testing on whether you have a blood clotting disorder, which most aren't aware of without testing. One supplement they highly recommend juicers use to prevent clots is Nattokinase. One way to reduce red blood cells is eating one red grapefruit each day. My friend tried this and his values did come down, hard to say if it was due to the grape. My friend also paid a nurse to take out blood, many juicers used her illegal business lol, but these guys didn't even check their values before hand. I said it was idiotic.