diff --git a/spec/api-app-spec.js b/spec/api-app-spec.js
index be398c3014ca..b3bb716b9491 100644
--- a/spec/api-app-spec.js
+++ b/spec/api-app-spec.js
@@ -163,8 +163,6 @@ describe('app module', function () {
   describe('app.importCertificate', function () {
     if (process.platform !== 'linux') return
 
-    this.timeout(5000)
-
     var w = null
     var certPath = path.join(__dirname, 'fixtures', 'certificates')
     var options = {
diff --git a/spec/api-browser-window-spec.js b/spec/api-browser-window-spec.js
index 8203e0bdf1f9..dad48d5497aa 100644
--- a/spec/api-browser-window-spec.js
+++ b/spec/api-browser-window-spec.js
@@ -211,7 +211,6 @@ describe('browser-window module', function () {
     })
 
     it('does not crash in did-fail-provisional-load handler', function (done) {
-      this.timeout(10000)
       w.webContents.once('did-fail-provisional-load', function () {
         w.loadURL('http://127.0.0.1:11111')
         done()
@@ -284,7 +283,6 @@ describe('browser-window module', function () {
     })
 
     it('emits when window is shown', function (done) {
-      this.timeout(10000)
       w.once('show', function () {
         assert.equal(w.isVisible(), true)
         done()
@@ -310,7 +308,6 @@ describe('browser-window module', function () {
     })
 
     it('emits when window is hidden', function (done) {
-      this.timeout(10000)
       w.show()
       w.once('hide', function () {
         assert.equal(w.isVisible(), false)
@@ -1002,7 +999,6 @@ describe('browser-window module', function () {
     })
 
     it('emits when link with target is called', function (done) {
-      this.timeout(10000)
       w.webContents.once('new-window', function (e, url, frameName) {
         e.preventDefault()
         assert.equal(url, 'http://host/')
@@ -1019,7 +1015,6 @@ describe('browser-window module', function () {
     }
 
     it('emits when window is maximized', function (done) {
-      this.timeout(10000)
       w.once('maximize', function () {
         done()
       })
@@ -1034,7 +1029,6 @@ describe('browser-window module', function () {
     }
 
     it('emits when window is unmaximized', function (done) {
-      this.timeout(10000)
       w.once('unmaximize', function () {
         done()
       })
@@ -1050,7 +1044,6 @@ describe('browser-window module', function () {
     }
 
     it('emits when window is minimized', function (done) {
-      this.timeout(10000)
       w.once('minimize', function () {
         done()
       })
@@ -1063,8 +1056,6 @@ describe('browser-window module', function () {
     // This test is too slow, only test it on CI.
     if (!isCI) return
 
-    this.timeout(20000)
-
     it('subscribes to frame updates', function (done) {
       let called = false
       w.loadURL('file://' + fixtures + '/api/frame-subscriber.html')
@@ -1513,7 +1504,6 @@ describe('browser-window module', function () {
   describe('dev tool extensions', function () {
     describe('BrowserWindow.addDevToolsExtension', function () {
       let showPanelIntevalId
-      this.timeout(10000)
 
       beforeEach(function () {
         BrowserWindow.removeDevToolsExtension('foo')
@@ -1595,8 +1585,6 @@ describe('browser-window module', function () {
     })
 
     it('works when used with partitions', function (done) {
-      this.timeout(10000)
-
       if (w != null) {
         w.destroy()
       }
@@ -1747,8 +1735,6 @@ describe('browser-window module', function () {
   })
 
   describe('offscreen rendering', function () {
-    this.timeout(10000)
-
     beforeEach(function () {
       if (w != null) w.destroy()
       w = new BrowserWindow({
diff --git a/spec/api-ipc-spec.js b/spec/api-ipc-spec.js
index 3cd10e971e8f..bc286dd17c37 100644
--- a/spec/api-ipc-spec.js
+++ b/spec/api-ipc-spec.js
@@ -434,8 +434,6 @@ describe('ipc module', function () {
     })
 
     it('does not crash when reply is not sent and browser is destroyed', function (done) {
-      this.timeout(10000)
-
       w = new BrowserWindow({
         show: false
       })
diff --git a/spec/api-net-spec.js b/spec/api-net-spec.js
index 9ddc11986c31..45741b5f1318 100644
--- a/spec/api-net-spec.js
+++ b/spec/api-net-spec.js
@@ -26,7 +26,6 @@ const kOneKiloByte = 1024
 const kOneMegaByte = kOneKiloByte * kOneKiloByte
 
 describe('net module', function () {
-  // this.timeout(0)
   describe('HTTP basics', function () {
     let server
     beforeEach(function (done) {
diff --git a/spec/chromium-spec.js b/spec/chromium-spec.js
index ff27d0ecbe22..611ef16f232d 100644
--- a/spec/chromium-spec.js
+++ b/spec/chromium-spec.js
@@ -28,8 +28,6 @@ describe('chromium feature', function () {
 
   describe('sending request of http protocol urls', function () {
     it('does not crash', function (done) {
-      this.timeout(5000)
-
       var server = http.createServer(function (req, res) {
         res.end()
         server.close()
@@ -78,8 +76,6 @@ describe('chromium feature', function () {
 
   xdescribe('navigator.webkitGetUserMedia', function () {
     it('calls its callbacks', function (done) {
-      this.timeout(5000)
-
       navigator.webkitGetUserMedia({
         audio: true,
         video: false
@@ -279,8 +275,6 @@ describe('chromium feature', function () {
   })
 
   describe('window.opener', function () {
-    this.timeout(10000)
-
     let url = 'file://' + fixtures + '/pages/window-opener.html'
     let w = null
 
@@ -312,8 +306,6 @@ describe('chromium feature', function () {
   })
 
   describe('window.opener access from BrowserWindow', function () {
-    this.timeout(10000)
-
     const scheme = 'other'
     let url = `${scheme}://${fixtures}/pages/window-opener-location.html`
     let w = null
@@ -363,8 +355,6 @@ describe('chromium feature', function () {
   })
 
   describe('window.opener access from <webview>', function () {
-    this.timeout(10000)
-
     const scheme = 'other'
     const srcPath = `${fixtures}/pages/webview-opener-postMessage.html`
     const pageURL = `file://${fixtures}/pages/window-opener-location.html`
diff --git a/spec/static/index.html b/spec/static/index.html
index 336274a71076..c89fe55fea39 100644
--- a/spec/static/index.html
+++ b/spec/static/index.html
@@ -55,6 +55,7 @@
   var mocha = new Mocha();
 
   mocha.ui('bdd').reporter(isCi ? 'tap' : 'html');
+  mocha.timeout(isCi ? 30000 : 10000)
 
   var query = Mocha.utils.parseQuery(window.location.search || '');
   if (query.grep) mocha.grep(query.grep);