Average cell phone conversation lasts 3 minutes 15 seconds. Commuters who use their phones in the car and drive an hour or more a day listened to the radio for 32 minutes a day in 2003, compared with 26 minutes in 2006, Bridge Ratings said.The time that such a commuter spends talking in the car has risen to 13.9 minutes a day, from 10.45 minutes a day in 2003.ommuters who use their phones in the car and drive an hour or more a day listened to the radio for 32 minutes a day in 2003, compared with 26 minutes in 2006, Bridge Ratings said. The time that such a commuter spends talking in the car has risen to 13. By ZDNet Editors for IT Facts |. | Topic: Tech Industry.