You just need to do some math:Lean body mass at 27% = 52.6-(52.6*0.27)=38.2 KgLean body mass at 17% = 52.6-(52.6*0.17)=43.68.2 KgWe set the change in body weight to zeroIncrease lean body mass by 5.48 Kg while keeping your weight constant (Ideal body composition)People gain an average of .916 lbs (0.416) of muscle per month.We need to find the number of months where .416 Kg is the average change weight per month5.48/0.416=13.16 Months.Also, we assume that the calories are set to K=constant.I would suggest to consult a registered dietitian for the above plan to work and use a progress weight training program (no cardio) at least 3 to 4 times a week (burning about 2500 to 3500 calories a week).