Gantt-View: Duration and intervall

We want to plan and track our mill shutdowns with asana. The downtime is in total several hours. To discuss the tasks and dependencies, we want to use the Gantt-chart. Right now, there are two problems:

The column duration is rounded to whole days. That’s in our case without any additional information.
The minimum value within the view is “Day”. That’s also without benefit. We need hours as well.

Please add this functionality.
Thank you