In Project, the default task duration unit is days, but you can change it to be minutes, hours, weeks, or months:
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            Choose File > Options. 
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            In the Project Options dialog box, choose Schedule. 
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            Under Scheduling options for this project, in the Duration is entered in list, select a duration unit. 
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            To use the same setting automatically in all future projects, select All New Projects in the Scheduling options for this project list. 
 
                         
				 
				