diff --git a/.github/workflows/tf-acc-test.yaml b/.github/workflows/tf-acc-test.yaml
index 1debe335..5f699efe 100644
--- a/.github/workflows/tf-acc-test.yaml
+++ b/.github/workflows/tf-acc-test.yaml
@@ -44,6 +44,7 @@ jobs:
         id: start_time
         run: |
           echo "time=$(date --rfc-3339=ns)" >> ${GITHUB_ENV}
+          echo "start=$(date +%s%N)" >> ${GITHUB_ENV}
 
       - name: Notify
         uses: ./.github/actions/notify
@@ -94,6 +95,12 @@ jobs:
         id: end_time
         run: |
           echo "time=$(date --rfc-3339=ns)" >> ${GITHUB_ENV}
+          end=$(date +%s%N)
+          echo "end=${end}" >> ${GITHUB_ENV}
+          start=${{ steps.start_time.outputs.start }}
+          diff=$((end-start))
+          duration=sprintf "%s.%s" "${diff:0: -9}" "${diff: -9:3}"
+          echo "duration=${duration}" >> ${GITHUB_ENV}
 
       - name: Notify
         uses: ./.github/actions/notify
@@ -101,7 +108,7 @@ jobs:
           webhook_url: ${{ secrets.GOOGLE_WEBHOOK_URL }}
           title: "[END] Terraform Acceptance Tests"
           subtitle: "${{ forgejo.event_name }} on branch ${{ forgejo.ref }} with status: ${{ forgejo.event_name == 'workflow_dispatch' && steps.manual_run.outputs.status || steps.automatic_run.outputs.status }}"
-          event_title: "run ended: ${{ steps.end_time.outputs.time }}"
+          event_title: "run ended: ${{ steps.end_time.outputs.time }}, duration: ${{ steps.end_time.outputs.duration }} seconds"
           event_author: ${{ forgejo.actor }}
           event_body: "${{ forgejo.event_name == 'workflow_dispatch' && steps.manual_run.outputs.result || steps.automatic_run.outputs.result }}"
           event_number: ${{ forgejo.event.id }}