Can anyone help me with building a chart or graph of cell phone records and text messages from cell phone bills? Let's say a call originated on September 30, 2009 at 5:18 PM and lasted for 5 minutes. I have been able to plot the date as the X axis and time as the Y axis, but am unsure how to show the duration? The idea is to show the amount of time an individual is on the phone at specific times of the day. Thanks!