How long should I work out while fasting?

The general guideline for exercise and healthy weight is:

1. >150 minutes of moderate-intensity (heavy breathing) exercise WEEKLY
2. >75 minutes of high-intensity (out of breath) exercise WEEKLY
3. Mixed of both, such as 100minutes moderate-intensity + 45 minutes high-intensity

Generally, 30-45 minutes a day, 4-5 days a week will be able to meet the guideline and assist in weight loss.