It's more about your workout techniques than the amount of time. Make sure you: 1. Exercise for all your muscles in a week 2. Focus calisthenics (training with your own body weight) 3. Increase dumbbell and barbell weights weekly or in 2 weeks 4. Do aerobics and running If you just focus on weight, ታብጣለህ። For a proper ቁመና do what I told you. 60-90 mins is aight for a beginner