Since recurrent appointments are single items in your calendar, with all of
the recurrences calculated from the base entry and not really separate
entries in the calendar, I think you'll have to use separate entries for
each appointment if you want to display a cardinal number in the appointment
data.  In other words, I think you have no choice but to do it manually.

you'll need to do it manually.
you can use this method to make it easier:
http://www.outlook-tips.net/howto/countdown.htm