Gantt Chart:

My projects are rarely longer than a couple of days but I need to "drill down" to the hours and minutes for various disciplines so seeing the duration in "DAYS" doesn't help me... 

How can I display the DURATION in "HOURS"? (see attached pic)

I tried adding the "WORK" column but that only shows the total man-hours per group (disciplines that are indented) and does not distinguish/separate between singular and concurrent activities.