Android Question Gantt Chart for showing date AND hours


Licensed User
Hello, actually i searched the forum and find different approaches for Gantt Charts used in Projekt-Management.
Google, Frappe....and some codeexamples for them. But i dont see any version or attemp to use hours or Minutes in those charts.
A projectmanagement is surely something for days especially for the long run.
But working on a project is not made in days. You work steps by steps and most of the time you calculate steps in hours. So you have to enter your time in minutes to see the progress of certain steps.

Did anyone fiddle around this hour problem and maybe have a bit of code forworking with hours and minutes in those gantt charts?