How long do you stay in the hospital after an anal fistula surgery?

I had been diagnosed with ovarian cancer and back in June ihad a very risky surgery and i had a hystorectomy done i had stage 3 cancer and my surgeon got 95% plus of the cancer out and only have a small amount left in me and my 2nd surgery was a reversal and now i have a fistula that is still leaking since July and i have to wear an iliOStomy bag till it stops draining its draining alot of bile even with bowel movements daily, im on a tpn for 12 hrs at nite and i just want everything to heal i really hate being like this.