--- a/taskcluster/taskgraph/transforms/nightly_l10n_signing.py
+++ b/taskcluster/taskgraph/transforms/nightly_l10n_signing.py
@@ -13,16 +13,19 @@ from taskgraph.util.treeherder import jo
 transforms = TransformSequence()
 
 
 @transforms.add
 def make_signing_description(config, jobs):
     for job in jobs:
         job['depname'] = 'unsigned-repack'
 
+        job.setdefault('worker', {})
+        job['worker']['max-run-time'] = 3600
+
         dep_job = job['dependent-task']
         dep_platform = dep_job.attributes.get('build_platform')
 
         job['upstream-artifacts'] = []
         if 'android' in dep_platform:
             job_specs = [
                 {
                     'artifacts': ['public/build/{locale}/target.apk'],

--- a/taskcluster/taskgraph/transforms/signing.py
+++ b/taskcluster/taskgraph/transforms/signing.py
@@ -94,17 +94,19 @@ def make_task_description(config, jobs):
         label = job.get('label', "{}-signing".format(dep_job))
 
         task = {
             'label': label,
             'description': "{} Signing".format(
                 dep_job.task["metadata"]["description"]),
             'worker-type': "scriptworker-prov-v1/signing-linux-v1",
             'worker': {'implementation': 'scriptworker-signing',
-                       'upstream-artifacts': job['upstream-artifacts']},
+                       'upstream-artifacts': job['upstream-artifacts'],
+                       'max-run-time': 3600,
+                      },
             'scopes': ["project:releng:signing:cert:nightly-signing"] + \
                     signing_format_scopes,
             'dependencies': {job['depname']: dep_job.label},
             'attributes': {
                 'nightly': dep_job.attributes.get('nightly', False),
                 'build_platform': dep_job.attributes.get('build_platform'),
                 'build_type': dep_job.attributes.get('build_type'),
             },