Question: how long does it take to grow 1 inch of muscle?
Answer: Speaking about timelines, the first inch would come in about 10-12 months (again based on functions related to training, diet, rest/recovery, busting plateaus, adding 15-20 lbs of muscles per inch gained etc) the second inch might take in around ~2 years or so and the third one ... you get the point, not many people ...