Scheduling and partial confirmation

Dear all

i have created a project, released......

now i am confirming the activities................my question is, when i am partially confirming the activities,

ex: duration of activity id 10 days, today when i am confirming the activity with 50% progress, its not showing the actual start date in the activity as well as in the project planning board.

if i am confirming 100%, then its showing the actual start as well as actual finsih .................

Question2: ex: if the duration of the activity is 10days, and if i have started the actvity today and completed 50%, will the system show the other 50% completion in one day.........and project the completion of the project to be completed by tomorrow??? or will the system shows the other 50% completion in 9 days.....

10 days actvity ....

50% completed in one day, will it project the other 50% completion in 1 days, or shows as 9 days??????

hope so my question is clear.

Regards

surya