24 Hours Calendar – how it works in MS PROJECT 2013

Hi,

I have a lot of questions about MS PROJECT 2013 Calendars, especially about 24 hours Calendar.

I will explain how does it work in MS PROJECT 2013.

First I will Create a very Simple Project with only one Task and only one Resource:

and:

I will assign Mary to Task:

Now let’s Look to Task Usage View:

As you can see Mary will work on the Task from Monday till Friday 8 hours per day, because of this:

and:

and:

So 5 days Duration means 5 days * 8 hours per day = 40 hours. Or Magic formula:

Work = Duration * Units ==>> Work = 5 days (5 days * 8 hours per day) * 100% Units for Mary = 40 Hours

Now I will say that Mary will work on 24 Hours Calendar:

If I now look at the Task Usage View, I’ll get:

As you can see Mary will work 16 hours at Monday (From 08:00 am till 00:00 = 16 hours), and 24 hours  on Tuesday (From 00:00 till 00:00), and that makes in total 16+24 = 40 hours, sop she will finish in two Days.

You should be careful when you are working with that Calendar. Ask yourself this: “Is it really possible that someone will work 24 hours per day?” I don’t think so. So when you can use this Calendar? From my point of View when you are using Machine (Automatic work), and not a human, because Machine can work 24 hours per day.

Regards!