Hey there! Tawny from Moz's Help Team here. These are great questions!
All of the links that end up in Just Discovered Links (JDL) come from tweeted feed.ly links.
This is separate to the Mozscape Index, which is what powers Open Site Explorer and the Links section of Moz Pro campaigns. Links that we discover are crawled for inclusion in our main index based on the authority of those URLs.
I’m afraid we don’t have a specific timeframe for when links from Just Discovered Links would appear in the Mozscape index. Because of the time it takes to identify links, schedule, crawl and index them, it can be one to two indexes before the links in JDL become established links in our index. A higher domain authority of linking domains will help ensure the links are included in the index, but do not help in speeding the process of getting links indexed.
The fastest way to get links indexed would be to a) tweet them as feed.ly links and b) search for your site in Open Site Explorer, which will prompt our tools to revisit your site and crawl it to include more links in the index. We start from your homepage and crawl the links we find from there, so it's possible that our tools might miss links that are more deeply buried into your site.
I hope that helps! If you've still got any questions, feel free to shoot us a note at help@moz.com and we'll do our best to sort you out. Cheers!

