Change the format of the total to [h]:mm:ss. The way you have it, hh:mm:ss, it displays only the fraction part of the day.

Making that format change, the total becomes 539:11:00. With the current format, 11:11:00 is displayed as it lops off 528 hours (22 days).

Edit: I defer to the previous answer above. For some reason, I missed it.