No, it doesn't have to be half the track, it has to be whatever the person specifies... it can be 50% minimum, but the default is 100%. And most people probably don't change the default.
Not to mention, again, all the tracks have to be TAGGED correctly. So, again, even with all those last.fm listens, you can probably easily throw another 2-3 million on top of that for the real total. Just insane.
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