How many minutes a day should I jog?

You ask a lot at one time. The other answers are good too. As for how many minutes you should jog? That would be at least 30 minutes. The reason for this is that you should get your heart going and stay with your excelled heart rate for 20 min then come back down. That can be done in 30 min. Since you are beginning remember that there is no shame in walking. If you need to walk than walk. If you can walk and keep your heart going than you are still getting the cardio benefit. Another thing, a distance walked is equal to tat same distance run as far as calories burned. ie . . . 5 mile run = 5 miles walked as far as calories burned! Your have burned 5 miles of calories, so to speak. Yes, there is a difference in the cardio benefit and your muscles are being trained differently. But the calories are the same. Running wil just be doing the work faster than walking. So get out there and do what you can and stay consistent. You will start to see results. good luck.