Again, it depends. If you’re training for a half marathon, you’ll gradually increase the length of your workouts from 20 minutes to around 90 minutes.
Our advice - do what you need to achieve your exercise or lifestyle goals. Most importantly, ensure your workout routine is sustainable.
Working out for 30 minutes, 3-4 times per week is usually a good target. But if you can only manage 20 minutes, 2 times per week, that’s generally better than nothing (assuming you have no serious health concerns preventing you from exercise).
* An exception to the rule above is if you’re training for events (running or others), as you’ll go through phases with increased or decreased training loads