Schedule the desired period in 4-week-steps. I.e. you schedule the first 4 weeks and transfer the suggestions as appointments into your calendar. To do so, click More and then the Convert to appointments button in the schedule. Then, set the Monday of the 5th week as the start time in the scheduling parameters and perform another calculation. Repeat this process several times if necessary.
Bear in mind that, during the scheduling of the upcoming weeks, portatour® assumes that the previous weeks are run according to the schedule. This is generally a problem of long-term planning: Unforeseen deviations during the work week lead to the necessity of rescheduling the following week.