# Duration Auto select Problem

• ### Question

• Dear All,

Duration Automatic select the 1.13 day in MS Project, why this occur.

Saturday, November 25, 2017 12:06 PM

• Vishwas'

Because the start and finish times are not on even hours.

John

Saturday, November 25, 2017 2:38 PM
• Vishwas,

Then you went to file, options, schedule and changed the definition (or conversion factor) of "1 Day" to 7 hours.

Any help?

Saturday, November 25, 2017 11:39 PM

1. your original duration was 1 day.  Out of the box, 1 day = 8 hours (as defined in File | options | schedule | hours per day.

2. 8 hours is actually 480 minutes.

3. You then change the hours per day figure to 7 hours.  So, it now takes 8/7 of a day to do the work, = 1.14 hours.

If you were not using quite those times, you might see 1.13....

Ben Howard [MVP] | web | blog | book | P2O

Sunday, November 26, 2017 8:52 PM
1. Go to file, options, and choose a date/time format that displays the time as well as the date.
2. Check what the working hours are in the project calendar.
3. Count the working hours between the start and finish of a task with 1 day duration.
4. Count the working hours between the start and finish of a task with 8 hours duration (input this as "8h").
5. Check file, options, schedule for the hours/day setting.

Try it. Get back to us with those numbers.

Wednesday, November 29, 2017 7:40 AM

### All replies

• Vishwas'

Because the start and finish times are not on even hours.

John

Saturday, November 25, 2017 2:38 PM
• Vishwas,

Then you went to file, options, schedule and changed the definition (or conversion factor) of "1 Day" to 7 hours.

Any help?

Saturday, November 25, 2017 11:39 PM

1. your original duration was 1 day.  Out of the box, 1 day = 8 hours (as defined in File | options | schedule | hours per day.

2. 8 hours is actually 480 minutes.

3. You then change the hours per day figure to 7 hours.  So, it now takes 8/7 of a day to do the work, = 1.14 hours.

If you were not using quite those times, you might see 1.13....

Ben Howard [MVP] | web | blog | book | P2O

Sunday, November 26, 2017 8:52 PM
• Sir, I haven't set Start or Finish time,

I inserted only a new task that have automatic duration 1.13 day on duration and set start/ finish time. I don't know why this occur?

Wednesday, November 29, 2017 6:35 AM
1. Go to file, options, and choose a date/time format that displays the time as well as the date.
2. Check what the working hours are in the project calendar.
3. Count the working hours between the start and finish of a task with 1 day duration.
4. Count the working hours between the start and finish of a task with 8 hours duration (input this as "8h").
5. Check file, options, schedule for the hours/day setting.

Try it. Get back to us with those numbers.

Wednesday, November 29, 2017 7:40 AM