Yes, every quarter, and it is the most useful hour of the month. Open the page the link sits on, check it is still indexed, check the site's newer posts are indexed too. Last time a third of my older placements had quietly dropped out of the index, not deleted, just no longer crawled because the host stopped linking to them internally. Those links were doing nothing. The fix was not new links, it was getting the old pages crawled again with a few support links pointed at them, and the rankings that had drifted came back inside a month. Most people buy replacement links for a problem a recrawl would have solved.