how long should a workout be to build muscle
The most effective muscle building workouts will last anywhere from 40-60 minutes â but sometimes less and sometimes a little more. The only time I would really recommend lifting weights for more than 60 minutes is if you are doing a strength phase and you are taking rests of 2.5-5 minutes.y Kevin on May 8, 2012. Another common question that people who are looking to gain weight/muscle ask is how long they should be in the gym training for to ensure they are building muscle.