After I applied for the Rollback, I spent most of my time playing my son's account or assisting FC members with things while I waited.
The only progression I did was the Clown Dungeon before it timed out. Placed the Costume in a Retainer storage (I love that outfit).
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It took about 2 weeks for the rollback to actually start, and about 18 hours once it started (I think).
I received an email the next day from the Technician when it was completed.