You can do this with Time to SLA.
You can enter your SLA start as Date field:Created or the first status in your workflow, SLA End as Date Field: Resolved or the Done statuses in your workflow and enter your SLA Goal according to your priority. For your goal you can enter a duration (like 2h) or a negotiation date (e.g. due date) or a dynamic duration (different SLA goals for each issue). You can define reset conditions, pause conditions, notifiers, extract reports and do so much more.
Please let me know if you have further questions.
Please note that I'm one of the members of the Snapbytes team.
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