Duration days changing when updating % complete

[slinkster]

I am somewhat new @ project and am just learning so bare with me, team. I am using Project 2010.

So I base-lined a set of deliverable’s, set the start, current and status date, updated the % comp to 10% on the first task within the deliverable group, and then hit F9 to update the project. When I did that the days on this particular task went from 12 to 14.8 days. I am still learning but was curious why project would push the duration out from 12 to 14.8 days?

Any help would be appreciated. Thank you!

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