AgendarSchedulesCheckin abc = new AgendarSchedulesCheckin();
abc.execute(null);

global class AgendarSchedulesCheckin Implements Schedulable {

    global void execute(SchedulableContext sc)
    {
        Datetime horaAtual = datetime.now();
        Date dataAtual = horaAtual.date();
        Integer horaJob = horaAtual.hour();
        Integer diaJob;
        Integer mesJob;

        if(horaJob == 23){
            dataAtual = dataAtual+1;
            horaJob = 0;
        }

        diaJob = dataAtual.day();
        mesJob = dataAtual.month();

        String cron_exp = '0 44 '+horaJob+' '+diaJob+' '+mesJob+' ?';
        String jobName = 'jobTeste';
        System.Schedule(jobName, cron_exp, new AgendarSchedulesCheckin());

        Integer horaAux = 45;

        for(Integer x = 0; x < 3; x++){
            cron_exp = '0 '+horaAux+' '+horaJob+' '+diaJob+' '+mesJob+' ?';
            jobName = 'jobTeste '+x;
            System.Schedule(jobName, cron_exp, new DeletarSemCheckinSchedule());
            horaAux = horaAux+3;
        }
    }
}