By default when we create a new project in Microsoft Project it use 5 day work week. How about we want to use 6 day work week.

I will show you how to do it.

We have a simple project using default 5 days work week.

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We can see a task with 10 days duration start on 16-Sep and finish on 29-Sep.

Now we will change Project calendar from 5 days work-week to 6 days work-week.

Go to menu Project -> Change Working Time

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Click on Work Weeks tab and Detail button.

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Click on Saturday, Select “Set days to these specific working times”, Enter the working time.

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Click OK.

Now we can see Saturday is working day.

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We can add National Holiday by click on Exceptions tab. Enter holiday name, Start, Finish date of holiday.

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Now from 5-Feb-17 until 11-Feb-17 is non-working day.

After finish everything we click OK. Now our project use 6 days work-week. And we can see the task now finish earlier on 27-Sep.

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