for(Project p:mutliProject.getProjekte()){
        Job lastJob = getLastJob(JobList, p.getNr(), p.getJobCount());
        int ende = lastJob.getStart() + lastJob.getDuration();
        runTimes[p.getNr()-1] = ende - p.getStart();
    }

    Job getLastJob(ArrayList<Job> fullJobList, int ProjektNr, int jobCount){
        for(Job j:fullJobList)
            if(j.getProjectNr() == ProjektNr && j.getNr() == jobCount)
                return j;
        return null;
    }