roundwego,
If you are looking for an easy way to add it up, put all the hours in one column and all the minutes in anther. Adding up all the hours is straight forward.
The minutes takes a couple of steps. Add up all the minutes and divide by 60. Then take whatever is to the left of the decimal point and add it to your other hours from the other column, then take the number to the right of the decimal point and multiply by 60 again.
Then you get the total hours and minutes you flew. You could make a simple Excel Spreadsheet to do this.
Take Care,
Richard