It typically takes about one month to gain one to two pounds of muscle with proper strength training and nutrition. Beginners usually start to see noticeable muscle growth within 6 to 8 weeks, while more experienced lifters may see changes in as little as 3 to 4 weeks

. Muscle growth results from resistance training that causes microscopic muscle trauma, which the body repairs by increasing muscle fiber size. This process is supported by hormones like growth hormone that help convert amino acids into muscle protein

. Key factors influencing the rate of muscle gain include:

• Training consistency and intensity (e.g., lifting weights 2-3 times per week with 6-12 reps per set)
• Adequate protein intake (around 1.2 grams per kilogram of body weight daily)
• Caloric surplus of about 200-500 extra calories per day to fuel muscle growth
• Rest and recovery time to allow muscle repair and hypertrophy

On average, most individuals gain between 0.5 to 2 pounds of lean muscle per month depending on experience level and adherence to training and nutrition

. This pace is considered sustainable and healthy for long-term muscle development. In summary, gaining one pound of muscle generally takes a few weeks to a month with a consistent, well-structured resistance training program combined with proper nutrition and recovery.