You can actually get a very effective workout in just 10-20 minutes by persuing higher intensity workouts. Higher intensity burns similar numbers of calories in less time, and creates additional health and fitness benefits over what you would get from longer less intense workouts.
And with strength training, by choosing challenging weights/exercises (8 reps or less) and compound exercises that work several different muscles at once, you can get in a full-body workout in just 20-30 minutes. Further, you get about 70% of the maximum possible advantage from the 1st set, 90% with the 2nd and 95% with the 3rd. So even if you are restricted to 10-20 minutes, you can still get a good chunk of the benefits.
The other thing to consider is your overall activity level. If you can can combine 10-20 minute workout during the week with longer workouts on weekends (where hopefully you have more time), then you should have a pretty good activity level overall.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
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