Character Rollback Time Limit

Hello was wondering is there a limit to how far a rollback can be (i.e. three weeks). My account was compromised three weeks ago, I lost my gil and nothing else. After three weeks I find my account to get rolled back to a point after the compromise, so I still don't have my gil and lost what items I had selling in my retainers (that I had to move into my inventory for the time being)

I'm curious of how rollbacks happen and why rollbacks take this long if there seems to be a limit.