Unwinding a litigation hold Exchange 2010

After you have enabled a litigation hold in exchange 2010 - on entire database -

Once you disable the litigation hold:

1 - How does exchange start to purge itself of all of the data
2 - How can you force exchange to purge it immediately?
3 - How do you know when all of the data held from the litigation hold has been purged from exchange?

We have a few 500GB DB's that have been under litigation hold for two years - there are 8GB to 12GB of recoverable email in the DB from each mailbox based on the hold - I am concerned that when we remove the hold 1 - performance that will impact exchange 2 - timing of the purge and 3 - tracking its status.

Thank you,
sparkisAsked:
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