diff --git a/jobs/dockerfiles.yaml b/jobs/dockerfiles.yaml
index e72e94a..cb6256c 100644
--- a/jobs/dockerfiles.yaml
+++ b/jobs/dockerfiles.yaml
@@ -1,18 +1,17 @@
 - job:
     name: swh-jenkins-dockerfiles
     node: master
     scm:
       - git:
           url: http://forge.softwareheritage.org/source/swh-jenkins-dockerfiles.git
           wipe-workspace: false
     triggers:
       - pollscm:
-          cron: "*/30 * * * *"
-      - timed: "0 4 * * *"
+          cron: "H/30 * * * *"
     build-discarder:
       num-to-keep: 50
     wrappers:
       - timestamps
       - ansicolor
     builders:
       - shell: make checkrebuild all
diff --git a/jobs/swh-build.yaml b/jobs/swh-build.yaml
index 4d8d87c..a80d24d 100644
--- a/jobs/swh-build.yaml
+++ b/jobs/swh-build.yaml
@@ -1,30 +1,30 @@
 - job-template:
     name: swh-build-{name}
     node: swh-tox
 
     parameters:
       - string:
           name: BRANCH
           default: '{branch|master}'
     scm:
       - git:
           refspec: 'refs/heads/{branch|master}'
           url: https://forge.softwareheritage.org/source/swh-{name}.git
 
     numToKeep: 20
 
     triggers:
       - pollscm:
-          cron: "0 */3 0 0 0"
+          cron: "H */3 * * *"
 
     wrappers:
       - timestamps
 
     builders:
       - shell: python3 setup.py sdist bdist_wheel
 
     publishers:
       - archive:
           artifacts: "dist/*"
           allow-empty: "true"
           fingerprint: "true"
diff --git a/jobs/swh-metrics.yaml b/jobs/swh-metrics.yaml
index 329dcb3..50cebdb 100644
--- a/jobs/swh-metrics.yaml
+++ b/jobs/swh-metrics.yaml
@@ -1,29 +1,29 @@
 - job-template:
     name: swh-metrics-{name}
     node: swh-tox
 
     parameters:
       - string:
           name: BRANCH
           default: '{branch|master}'
     scm:
       - git:
           refspec: 'refs/heads/{branch|master}'
           url: https://forge.softwareheritage.org/source/swh-{name}.git
 
     numToKeep: 20
 
     triggers:
       - pollscm:
-          cron: "0 */3 0 0 0"
+          cron: "H */3 * * *"
 
     wrappers:
       - timestamps
 
     builders:
       - shell: mkdir -p reports
       - shell: python3 -m tox -e flake8
 
       - shell: python3 -m radon raw --json swh/ > reports/radon_raw.json
       - shell: python3 -m radon cc --json swh/ > reports/radon_cc.json
       - shell: python3 -m radon mi --json swh/ > reports/radon_mi.json
diff --git a/jobs/swh-tests.yaml b/jobs/swh-tests.yaml
index 72c86c9..4de54f4 100644
--- a/jobs/swh-tests.yaml
+++ b/jobs/swh-tests.yaml
@@ -1,47 +1,47 @@
 - job-template:
     name: swh-tests-{name}
     node: swh-tox
 
     parameters:
       - string:
           name: BRANCH
           default: '{branch|master}'
     scm:
       - git:
           refspec: 'refs/heads/{branch|master}'
           url: https://forge.softwareheritage.org/source/swh-{name}.git
 
     numToKeep: 20
 
     triggers:
       - pollscm:
-          cron: "0 */3 0 0 0"
+          cron: "H */3 * * *"
 
     wrappers:
       - timestamps
 
     builders:
       - shell: mkdir -p reports
       - shell: python3 -m tox -e py3 -- --with-coverage --cover-xml --cover-xml-file=./reports/covergage.xml --cover-package=swh.{name} --with-xunit --xunit-file=./reports/test-results.xml
       - shell: python3 -m coverage xml -o ./reports/coverage.xml
 
     publishers:
       - junit:
           results: "reports/test-results.xml"
       - cobertura:
           report-file: "reports/coverage.xml"
           fail-no-reports: "false"
           fail-unhealthy: "false"
           fail-unstable: "false"
           only-stable: "false"
           source-encoding: "UTF_8"
           zoom-coverage-chart: "false"
           targets:
             - files:
                 healthy: 10
                 unhealthy: 20
                 failing: 30
             - method:
                 healthy: 50
                 unhealthy: 40
                 failing: 30