Telogen Effluvium and Minoxidil, how long does shedding usually last?

Hi. I am a 26 year old female who had been having major hair shedding for 3 and a half months maybe longer that I didn’t really notice. I visited my doctor for full bloods and all was fine. I then went to see a Trichologist who suggested 3% Minoxidil. I have been using this for the past month and my hair loss hasn’t seemed to calm down at all if anything it’s getting worse. I’m really worried how much longer the shedding will last as I’m worried I’m not going to have any hair left as it’s already so thin.