From email: Scheduling down to minutes required

[DmitryBarashev]

This problem was discussed here a few times. Please see discussions:

New features request

This feature can be done in general. As formulated in this particular topic (up to 2 decimal digits => 15 minutes precision) it is expensive bothin terms of time, efforts and consequently money. The costs include not only working with code, but also UI (re)design. While being expensive, the risks that this feature will most likely break something for those who don’t need minute and even hour resolution (believe me that many, if not absolute majority of our customers who usually work in construc…

Task duration with decimal

The impact of adding hours is basically rewriting the major part of the codebase. No, we have no such plans. The impact of splitting the day into say 4 parts is more manageble, but again it is not for the nearest updates.

and ticket in the issue tracker: Duration in hours · Issue #225 · bardsoftware/ganttproject · GitHub