I am a 19 year old female. I am a beginner at weight training ive started about 2 and a half weeks ago. I am already noticing a muscle increase. I can gain weight very easily and if i try i can loose weight. I am 135lbs and 5'5inches. I spend about 45 minutes in the gym with 10 minutes of cardio. I just want to know if i continue this way how long will it take me to gain muscle mass. I eat very healthy and take suppliments. I take two days off for rest and train two muscle groups in one training day. Thanks a lot!