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.
Before you determine how long you need to bike, set some weight-loss goals. A loss of one pound of fat requires you to burn 3,500 calories, so if you want to lose one pound each week, you will need to burn 500 calories a day. The best way to do this is to combine diet and exercise to create your daily caloric deficit.