The amount of calories you burn while jogging is dependent on your pace. This is because, when you run at a higher pace, your body has to immediately work harder to maintain that pace. However, running faster increases your heart rate to a point that you not only burn more calories immediately, but your EPOC is far greater. EPOC (Excess Post-exercise Oxygen Consumption) has to do with how hard your body continues working even after you have completed an activity. When your heart rate is in an anaerobic state, it takes your body longer to recover, and thus you continue burning calories for the next 24 at an increased rate. If calorie burn is your main goal, you're likely better off planning your workouts around running plans and workouts that increase your heart rate.

If you are looking for just the average amount of calories that running burns, you can estimate that it's somewhere around 100 calories per mile (but this depends on pace and your individual size and weight). The "100 calories per mile" rule is for individuals of average weight. However, the more you weigh the more calories you burn because a bigger body requires more energy to move. (Typically, "average" for females is around 150 pounds and "average" weight for males is 200 pounds.)

It's also worth noting that 1 hour and 20 minutes of running is a significant amount of time exercising. However, losing 10 pounds in just 2 days isn't something you want to aim to continue doing because that is an alarmingly high rate. It is likely that the 10 lb weight loss you experienced was both from a bit of actual body mass loss, as well as "water weight" - on average, you'll lose about 16 oz of water from sweat after an hour of running. To ensure safety and to keep yourself injury free, make sure you are refueling yourself after each run appropriately. This means getting in good and adequate sources of fats, proteins, and carbohydrates and replacing everything you lost through sweat, plus some. This will you be able to continue running, and continue losing weight at a steady, safe pace without getting burned out or injured.

Sources
http://livehealthy.chron.com/much-water-weight-can-lose-running-30-minutes-7309.html
http://running.competitor.com/2015/03/training/many-calories-running-burn_123951
https://www.livestrong.com/article/304516-how-many-calories-do-you-lose-after-3-miles-of-running/