using a 24 hour clock in Microsoft Project 13

I am scheduling a project that should be completed in about 4 hours, but the project will be run over normal working hours (after 5pm).  I have set the calendar to be the 24 hour, and change that as well on the project information and the change working time.   The tasks still stop at 5:00pm and then resume at 8:00am.  However, I did not set the calendar BEFORE I started the project,   So, 3 questions
    can the duration be entered in seconds?
      Can I change the calendar after the project has been  started?
        Is the answer to #2 is "yes", why can I not change the working times?
        CeredAsked:
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        xtermieCommented:
        1) I don't think you can have the duration in minutes.  Try to check using the following:

        1.  Click View > Gantt Chart.
        2.  In the Duration column for the task, type the duration in minutes (m), hours (h), days (d), weeks (w), or months (mo).
        3.  If the new duration is an estimate, type a question mark (?) after it.
        4.  Press Enter.
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