Q: What is the duration of the primary
     eclipse in fractions of a period?


        The eclipse lasts for about 0.08 periods.


     The period is P = 6.889 days.
     How long is each eclipse in seconds?


        duration  =  (0.08 periods) * (6.889 days/period)

                  =   0.55 days

                  =  (0.55 days) * (86,400 seconds/day)

                  =   48,000 seconds