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We will disable the comment block timestamp, something like this:

# Lorem ipsum...
1 weeks 1 day ago
# Lorem ipsum...
1 day ago

After hack:

# Lorem ipsum...
# Lorem ipsum...

This trick requires core hacks, please be careful.

Open the following file with text editor:

modules/comment/comment.module

Find the following line:

$items[] = l($comment->subject, 'node/'. $comment->nid, NULL, NULL, 'comment-'. $comment->cid) .' '. t('@time ago', array('@time' => format_interval(time() - $comment->timestamp)));

Replace the line with:

$items[] = l($comment->subject, 'node/'. $comment->nid, NULL, NULL, 'comment-'. $comment->cid);

There you go, its done 🙂