=WEEKDAY(Start,2)<6
=WEEKDAY(Request,2)<6
=(Request-Start)>2
=NOT(AND(WEEKDAY(Start,2)>2,(Request-Start)<5))

=AND( WEEKDAY(Start,2)<6,
      WEEKDAY(Request,2)<6,
      (Request-Start)>2,
      NOT(AND(WEEKDAY(Start,2)>2,(Request-Start)<5))
     )

=AND( WEEKDAY(Today(),2)<6,
      WEEKDAY(Request,2)<6,
      (Request-Today())>2,
      NOT(AND(WEEKDAY(Today(),2)>2,(Request-Today())<5))
     )