It's time to stop when…
You take a break from work, fire up Google Reader and idly flick through a few feeds. Your eyes alight on a delicious link and you think, ohh must check that out.
Only then do you realise that you are reading your OWN RSS feed, and you’ve already bookmarked said link in delicious so you’ll check it out.
Sometimes the internets really is confussing, round and round it goes.