I took prozac 10mg for two days. how long will it take to get out of my system?

Up to 5 wks: It is difficult to determine the exact duration prozac will stay in the system, because people metabolize prozac at different rates. The longest it would probably stay in the system is 5 wks, (this is the "safe" washout time when there is no risk for drug interaction with MAO inhibitors.). Prozac has a half life of 7-9 days (pretty large margin there). but that does not mean it is out in 14-18 d.