Better things to do

Dead simple Chrome extension to save up some time.

You add a website to the list and the extension asks you to wait for 60 seconds before visiting it. Timer stops if the tab is not active.

Install

You can install from Chrome store.

Prevent from disabling

On OS X, at /Library/Managed\ Preferences/$USER create com.google.Chrome.plist with:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>ExtensionInstallForcelist</key>
	<array>
		<string>begggblpkegcnammjagcmplfnpopocla;https://clients2.google.com/service/update2/crx</string>
	</array>
</dict>
</plist>