Windchill Purge

I've started looking into the Purge Management function. I've already run through the "How to create" and it seemed I was successful in creating the purge job for an old context that is no longer used.

It's been going for a short while now and I was curious on how much time a purge might typically take. There are just over 12000 iterations affected by the purge. Is this something I should check on hourly or daily or what?

Thanks.