This is a very general question but one that is very common.

My very general guidelines for working out is the following:

- 3 weight lifting workouts of 1 hour or less each week

- A minimum of 2 cardio workouts per week of about 30 minutes each at a medium intensity, 3 cardio workouts per week is better

That's it.

Can you make good progress with a 20 minute workout 3 to 4 times per week?

Well, you need to be doing both weight lifting and cardio. If I had to choose only one workout style, that would be weight lifting as this can be modified to also increase cardiovascular conditioning.

But, I will always recommend a combination of weight training workouts and cardiovascular exercise workouts.

So the very general answer to "Is 20 minutes workout enough?" is NO, it is not enough.

Is a 20-minute weight lifting workout enough to build strength and muscle? Yes, it can be if designed properly.