Want to determine how long it takes for a past assignee to move an issue from one status to another.
You could have a look at the history tab of the issue and calculate the result. If you want to automate it, then you could use a plugin like Power Scripts or ScriptRunner. Or have a look at the Time in Status plugin, maybe it will solve your requirement.
https://marketplace.atlassian.com/apps/1211756/time-in-status?hosting=server&tab=overview
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