> is it possible to restrict diald only to work at e.g. one hour per day?
    >
    > and how? (config file, cron-job, etc.)

    >From the diald man page:

           restrict <start> <end> <weekdays> <monthdays> <months>

           or-restrict <start> <end> <weekdays> <monthdays> <months>
                  Normally filter  rules  apply  at  all  times.  The
                  restrict statement makes all filter rules following
                  the restrict statement, up  to  the  next  restrict
                  statement, apply only at the times indicated by the
                  restrict statement.