without plugin how to calculate time change transition to transition
It general you need ChangeHistoryManager.
Use method
to get all beans for status changes.
https://docs.atlassian.com/software/jira/docs/api/7.0.9/com/atlassian/jira/issue/changehistory/ChangeHistoryManager.html#getChangeItemsForField-com.atlassian.jira.issue.Issue-java.lang.String-
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