If a company or individual posting to craigslist is having trouble with competitors, fake posts, harassment, etc., there are a number of ways to get things done. I'm sure that Craigslist, like every other site, makes people jump over a few hurdles before they can get in touch with a live human.
Calories Burned. On average, a 150-pound person burns 91 calories biking for 20 minutes at a leisurely pace of less than 10 miles per hour, according to the Calorie Control Council's Get Moving Calculator. The caloric burn increases to 136 calories when intensity escalates to a moderate pace, 12 to 13.9 miles per hour.
Caloric Burn. Both body weight and level of intensity impact just how much caloric burn you will experience. Harvard Heart Letter notes that an individual riding the stationary bike at a moderate level for 30 minutes will burn an average of 210 calories at 125 pounds, 260 calories at 155 pounds and 311 calories at 185 pounds.