Hi Sophie,
Each surgeon has a different answer but the range you mentioned sounds correct. I think mine said a couple weeks in advance, but I wasn't paying attention to that detail because I took care of permanent hair removal before starting HRT or anything else.
I checked and just noticed my
FFS surgeon's site mentions electrolysis should be avoided 3 months
after FFS. That's probably specific to each surgeon based on their experience with potential infections and other complications. I think local hospital rules also impact surgical requirements, so we also see different answers for temporarily stopping Estradiol for surgery.
If you have selected an FFS surgeon their office can provide the accurate answer based on their requirements.