--- a/taskcluster/ci/test/compiled.yml
+++ b/taskcluster/ci/test/compiled.yml
@@ -65,16 +65,20 @@ jittest:
             .*-qr/.*: ['mozilla-central', 'try']
             default: built-projects
     chunks:
         by-test-platform:
             windows.*: 1
             windows10-64-ccov/debug: 6
             macosx.*: 1
             default: 6
+    max-run-time:
+        by-test-platform:
+            windows10-64-ccov/debug: 7200
+            default: 3600
     mozharness:
         chunked:
             by-test-platform:
                 windows.*: false
                 macosx.*: false
                 default: true
     tier:
         by-test-platform:

--- a/taskcluster/ci/test/mochitest.yml
+++ b/taskcluster/ci/test/mochitest.yml
@@ -192,16 +192,20 @@ mochitest-chrome:
             default: default
 
 mochitest-clipboard:
     description: "Mochitest clipboard run"
     suite: mochitest/clipboard
     treeherder-symbol: M(cl)
     loopback-video: true
     instance-size: xlarge
+    max-run-time:
+        by-test-platform:
+            windows10-64-ccov/debug: 7200
+            default: 3600
     e10s:
         by-test-platform:
             linux32/debug: both
             default: true
     mozharness:
         mochitest-flavor: plain
         extra-options:
             by-test-platform:
@@ -218,17 +222,20 @@ mochitest-clipboard:
 mochitest-devtools-chrome:
     description: "Mochitest devtools-chrome run"
     suite:
         by-test-platform:
             linux64-jsdcov/opt: mochitest/mochitest-devtools-chrome-coverage
             default: mochitest/mochitest-devtools-chrome-chunked
     treeherder-symbol: M(dt)
     loopback-video: true
-    max-run-time: 5400
+    max-run-time:
+        by-test-platform:
+            windows10-64-ccov/debug: 7200
+            default: 5400
     run-on-projects:
         by-test-platform:
             linux64-jsdcov/opt: ['try']  # jsdcov only on try, Bug 1442823
             default: built-projects
     chunks:
         by-test-platform:
             windows10-64-ccov/debug: 10
             default: 8
@@ -282,17 +289,20 @@ mochitest-gpu:
             linux64-qr/.*: 1
             windows10-64-asan.*: 3
             default: default
 
 mochitest-media:
     description: "Mochitest media run"
     suite: mochitest/mochitest-media
     treeherder-symbol: M(mda)
-    max-run-time: 5400
+    max-run-time:
+        by-test-platform:
+            windows10-64-ccov/debug: 7200
+            default: 5400
     run-on-projects:
         by-test-platform:
             .*-qr/.*: ['mozilla-central', 'autoland', 'mozilla-inbound', 'try']  # exclude beta and project branches
             default: built-projects
     loopback-video: true
     virtualization:
         by-test-platform:
             windows10-64-qr/.*: virtual-with-gpu

--- a/taskcluster/ci/test/reftest.yml
+++ b/taskcluster/ci/test/reftest.yml
@@ -71,16 +71,17 @@ jsreftest:
             default: 3
     e10s:
         by-test-platform:
             linux64-jsdcov/opt: false
             default: true
     max-run-time:
         by-test-platform:
             android.*: 7200
+            windows10-64-ccov/debug: 7200
             default: 3600
     tier:
         by-test-platform:
             linux64-qr/.*: 1
             windows10-64-asan.*: 3
             default: default
 
 reftest:

--- a/taskcluster/ci/test/web-platform.yml
+++ b/taskcluster/ci/test/web-platform.yml
@@ -19,17 +19,20 @@ web-platform-tests:
     suite: web-platform-tests
     treeherder-symbol: W(wpt)
     chunks:
         by-test-platform:
             macosx64/opt: 5
             macosx64/debug: 10
             windows10-64-ccov/debug: 15
             default: 12
-    max-run-time: 7200
+    max-run-time:
+        by-test-platform:
+            windows10-64-ccov/debug: 10800
+            default: 7200
     e10s:
         by-test-platform:
             linux32/debug: both
             default: true
     mozharness:
         chunked: true
         extra-options:
             - --test-type=testharness