Deleting workflow instances on production

[Kouw, FA - SPLTX]

Hello,
 
I know I can delete work items using tx SWWL. I also know it is not
advised to do this in a production client. But we have a situation in
which many (thousands of) workflow instances have been started, which
shouldn't have been started (a job has run which has created change
documents for which a workflow is triggered, we didn't think of this in
advance).
 
My question is: what is the right strategy to delete these workflow
instances? Just running SWWL for the complete selection? Delete them
group by group? I'm not sure how long it will take to delete them and
the problems this can cause. All advise is welcome!
 
Regards,
 
Fred Kouw
 
 
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