I have a CSV file containing activities where each activity has a time associated with it in minutes and seconds (two separate columns). I want to sum up the time for all the activities and the total time will be several hundred hours and should be shown as hhh:mm:ss. I started to do a lot of Div and Mod of the sums of minutes and seconds, respectively, to get the total sum, but isn't there some easier way to accomplish this?
