@ezgoer - As mentioned, it literally adds behind whatever is left in the target URL cache. You import a list, and you also have sitelists turned on to wherever you store your list.
In theory, if you run out of targets, it should then go to your sitelists and start processing them. What I have found through trial and error is that for more links, it is better to just run the imported list for most of the day, stop ser, switch all projects to Active(V), give it an hour or two to verify, stop ser, clear cache, and then reimport the list into each project, and then activate all projects again. And then rinse and repeat. For whatever reason, I make a lot more links.
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In the window below it seems it is going forever.