I'm looking for a custom field, which would allow me to display how much time an issue spent on a specific status during business hours ONLY. Any ideas how I can implement such a feature?
You could use an add-on for it. Time in Status
https://marketplace.atlassian.com/plugins/com.obss.plugin.time-in-status/server/overview
If you want to write your own custom field then you would need to go through the issue history and calculate time in status based on the history.
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