Q:  What is the duration of the eclipse?  Measure the two widths
             and average them.  Express the result in terms of
             a fraction of the period, and in terms of seconds.


         Reading the graphs by eye, I measure

              duration of primary eclipse    =  0.040  "phase"

                                             =  0.040 * period


              duration of secondary eclipse  =  0.040 * period

         so

                  average duration           =  0.040 * period

                                             =  0.040 * 4.32 x 10^5  seconds

                                             =  1.73 x 10^4   seconds