You probably can use format to format your calculation result as hh:mm:ss, but it will be good if you can share a sample workbook.
Hi Gian Pedrun ,
It would be better if you had been shared twbx file as it can be solved in many different ways .
I am not sure but you can solve it using dual axis chart and remove the number axis and keep only time axis .So you are just hiding the number axis and showing the time axis .
In case you stuck somewhere please attach your work .
I have added the twbx file.
I have tried things with dual axis but was not able to resolve it ;-(
Thank you very much for quick answer. The solution is so simple ;-)
No worries, glad it helped