A number of factors need to be considered in answering this. If you are not very fit and have lots of pounds to drop, that may well be plenty. 5 mph is more than a very brisk walk for most people and would be a jogging pace for many who are trying to lose weight.Another factor is whether you can handle 5 mph for an extended time. Can you handle that and keep up a conversation and last for at least 20 minutes? How long you can last is a bigger indication of fitness than speed is. See what it takes to last 20 minutes at that or any other speed that is manageable and then look to work up towards 30 minutes gradually.
Work out with your heart rate in the fat-burning zone. : 60-70% of your maximum heart rate (60-75% if you're better conditioned). HERE'S THE SIMPLE FORMULA TO DETERMINE IF YOU'RE RUNNING AT A "GOOD SPEED": Subtract your age from 220 to find your max heart rate. Take this # & multiply by .60---> this is the minimum heart rate you should maintain while performing your physical activity. THEN take your MAX heart rate & multiply it by .70--> the upper range for maximal fat burning. EXAMPLE (40 yr old person): 220-40=180 (max heart rate)180x.60=108 (lower limit of minimal fat-burning range)180x.70=126 (upper limit of maximal fat-burning range) As you can see, the answer to your question is different for everyone depending on the person's age, the level of your conditioning and how fast your heart is beating. This is the best answer to your question because the rate that your heart is going while exercise is what truly determines results. I hope you do the math and it helps. It surely cleared this up for me when I wondered the same thing.
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