diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index ee0601ba..efa88714 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -283,7 +283,7 @@ jobs:
       - uses: google/clusterfuzzlite/actions/run_fuzzers@v1
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
-          fuzz-seconds: 3600
+          fuzz-seconds: 14400
           mode: 'prune'
           storage-repo: https://${{ secrets.FULL_ACCESS_TOKEN }}@github.com/oxigraph/clusterfuzzlite-oxigraph.git