I want to create a bar chart using 24 hour time data and elapsed time. For example, over a 24 hour period, I have start and stop times for an activity and can calculate an elapsed time.

I want to represent these elapsed time (blocks) in a horizontal bar chart over the 24 hour period. Activity one is 30 minutes long beginning at 4 am, activity two is 90 minutes long and begins at 1:30 pm, etc.

The finished product would have a 24 hour period on the y axis and several "blocks" of time vertically along the x axis.

Any help would be greatly appreciated.