Gantt plugin - 10hr working days

Hi everyone, does anyone know how to set 10 hour working days, 7 days a week in the Gantt plugin? I can get 24x7 days working and 8hr working days 5 days a week but no matter what I try I can't find a way to get 10hour days 7 days a week working. Any help would be much appreciated.

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Elise Salt
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