lpierpont-
For that field to transfer to QuickBooks it has to remain as minutes but within that table are 2 fields for Duration one for hours and one for minutes.
The duration field that is one the screen by default is for Minutes, hide that one and add the duration hours field to the screen, then add some actions to duration hours so that when it is changed it multiplies its value by 60 and puts it into the duration minutes field.
-Michael