when I enter the start times and end times of tasks, software calculates duration of task in decimal form. I have checked calender setting and I think it is correct but I can't solve this problem. I don't know what should I do?

  • I'd check the default start and end times in File > Options. As an aside, you shouldn't be entering start and end dates or times of tasks - those should be calculated by Project - unless you are working solely with manually scheduled tasks. – JulieS Jan 25 '16 at 20:25

Durations are tracked by MS Project to the minute level. Using decimals in durations allows detail in durations for:

  • tasks starting or ending at times other than the work day start and finish that you define as defaults
  • tasks that take fractional amounts of a day, say 2.5 hours, at resource usage of 100%

Also, decimals allow easier aggregations of these for summarization.

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