I am having trouble with calculating the total time (hour and minute in format H:mm).
Firstly I tried to make its type in Document is Date, but Date type can not sum the total time.
Now I am trying to make its type in Document becomes number, I can calculate the sum but I can not display it in Document with format H:mm (ex: 100 -> 1:40).
I hope that someone can help me with this issue.
Thank you a lot!
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