This extension will rescue your time by notifying you after customizable time limit while browsing time killing sites.
Step 0: Install extension from Chrome Web Store.
Step 1: Add time killing sites to watchlist.
To add in watchlist, go to that site and click on the extension icon. Then turn on watching by clicking the toggle button at bottom of popup window. It will immediately appear in watchlist (and alarm will be set behind the scene).
Extension popup window
Step 2: Get Notified!
A notification will be displayed with a light, short alarm sound when your time for browsing a listed site is over. In that notification, you'll have 2 buttons to choose -
Extension notification window
Step 3: Configure time limits (OPTIONAL).
By default, first notification will be displayed after 10 minutes of starting browsing a listed site. And, if you choose to Snooze in notification, the alarm will reset at 2 minutes. But you can change these time limits from Settings page (at the bottom of extension popup). You'll get the following options to configure -
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